編譯MatCaffe

轉自：http://blog.csdn.net/ws_20100/article/details/50525879

使用如下命令編譯MatCaffe

<code class="language-Shell hljs glsl has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">make <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">all</span> matcaffe</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

之後，你可以用以下命令測試MatCaffe：

<code class="language-Shell hljs go has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">make</span> mattest</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

如果你在運行上面命令時，遇到如下錯誤：libstdc++.so.6 version ‘GLIBCXX_3.4.15’ not found，說明你的Matlab庫不匹配。你需要在啓動Matlab之前運行如下命令：

<code class="language-Shell hljs javascript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">export LD_LIBRARY_PATH=<span class="hljs-regexp" style="color: rgb(0, 136, 0); box-sizing: border-box;">/opt/i</span>ntel/mkl/lib/intel64:<span class="hljs-regexp" style="color: rgb(0, 136, 0); box-sizing: border-box;">/usr/</span>local/cuda/lib64
export LD_PRELOAD=<span class="hljs-regexp" style="color: rgb(0, 136, 0); box-sizing: border-box;">/usr/</span>lib/x86_64-linux-gnu/libstdc++.so<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">.6</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

在Caffe根目錄啓動Matlab之後需要增加路徑：

<code class="language-Matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">addpath ./matlab</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

你可以使用savepath來保存Matlab搜索路徑，這樣下次就不用再添加路徑了。

---

使用MatCaffe

MatCaffe 和 PyCaffe 的使用方法很相似。

下面將用一個例子來解釋MatCaffe的具體使用細節，假設你已經下載了BVLC CaffeNet，並且在caffe根目錄啓動matlab。

<code class="language-Matlab hljs bash has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">model = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'./models/bvlc_reference_caffenet/deploy.prototxt'</span>;
weights = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'./models/bvlc_reference_caffenet/bvlc_reference_caffenet.caffemodel'</span>;
</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li></ul>

1.設置模式和設備

模式和設備的設置必須在創建一個net或solver之前。

使用CPU：

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-transposed_variable" style="box-sizing: border-box;">caffe.</span>set_mode_cpu();</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

使用GPU並指定gpu_id：

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-transposed_variable" style="box-sizing: border-box;">caffe.</span>set_mode_gpu();
<span class="hljs-transposed_variable" style="box-sizing: border-box;">caffe.</span>set_device(gpu_id);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

2.創建一個網絡並訪問它的layers和blobs

1.創建網絡

創建一個網絡：

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">net = <span class="hljs-transposed_variable" style="box-sizing: border-box;">caffe.</span>Net(model, weights, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'test'</span>); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">% create net and load weights</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

或者

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">net = <span class="hljs-transposed_variable" style="box-sizing: border-box;">caffe.</span>Net(model, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'test'</span>); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">% create net but not load weights</span>
<span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>copy_from(weights); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">% load weights</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

它可以創建一個如下的net對象：

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">  Net with <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">properties</span>:
           layer_vec: <span class="hljs-matrix" style="box-sizing: border-box;">[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>x23 caffe.Layer]</span>
            blob_vec: <span class="hljs-matrix" style="box-sizing: border-box;">[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>x15 caffe.Blob]</span>
              inputs: <span class="hljs-cell" style="box-sizing: border-box;">{<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'data'</span>}</span>
             outputs: <span class="hljs-cell" style="box-sizing: border-box;">{<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'prob'</span>}</span>
    name2layer_index: <span class="hljs-matrix" style="box-sizing: border-box;">[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">23</span>x1 containers.Map]</span>
     name2blob_index: <span class="hljs-matrix" style="box-sizing: border-box;">[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">15</span>x1 containers.Map]</span>
         layer_names: <span class="hljs-cell" style="box-sizing: border-box;">{<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">23</span>x1 cell}</span>
          blob_names: <span class="hljs-cell" style="box-sizing: border-box;">{<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">15</span>x1 cell}</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>

兩個containers.Map對象可以通過layer或者blob的名稱找到對應的索引。

2.訪問blob

你可以訪問網絡中的每一個blob，將data的blob填充爲全一：

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>blobs(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'data'</span>).set_data(<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">ones</span>(<span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>blobs(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'data'</span>).shape));</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

將data的blob中數值全部乘以10：

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>blobs(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'data'</span>).set_data(<span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>blobs(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'data'</span>).get_data() * <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

注意：因爲Matlab是以1作爲起始單元，且以列爲主，在Matlab中使用四維blob爲[width, height, channels, num]，且width是最快的維度，而且要在BGR通道。而且Caffe使用單精度浮點型數據。如果你的數據不是浮點型的，set_data將會自動轉換爲single。

3.訪問layer

你也可以訪問網絡的每一層，以便你作一些網絡調整。例如把conv1參數乘以10：

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>params(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'conv1'</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>).set_data(<span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>params(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'conv1'</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>).get_data() * <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">% set weights</span>
<span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>params(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'conv1'</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>).set_data(<span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>params(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'conv1'</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>).get_data() * <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">% set bias</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

你也可以如下代碼：

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>layers(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'conv1'</span>).params(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>).set_data(<span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>layers(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'conv1'</span>).params(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>).get_data() * <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>);
<span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>layers(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'conv1'</span>).params(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>).set_data(<span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>layers(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'conv1'</span>).params(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>).get_data() * <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

4.保存網絡

你僅僅需要如下代碼保存網絡：

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>save(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'my_net.caffemodel'</span>);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

5.獲得一層的類型(string)

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">layer_type = <span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>layers(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'conv1'</span>).type;</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

3.前向和後向計算

前向和後向計算可以使用net.forward或者net.forward_prefilled實現。函數net.forward將一個包含輸入blob(s)的cell數組作爲輸入，並輸出一個包含輸出blob(s)的cell數組。函數net.forward_prefilled將使用輸入blob(s)中的已有數據進行計算，沒有輸入數據，沒有輸出數據。

在通過一些方法（如：data = rand(net.blobs('data').shape);）產生輸入數據後，你可以運行：

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">res = <span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>forward(<span class="hljs-cell" style="box-sizing: border-box;">{data}</span>);
prob = res<span class="hljs-cell" style="box-sizing: border-box;">{<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>}</span>;</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

或者

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>blobs(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'data'</span>).set_data(data);
<span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>forward_prefilled();
prob = <span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>blobs(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'prob'</span>).get_data();</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li></ul>

後向計算使用net.backward或者net.backward_prefilled，並且把get_data和set_data替換爲get_diff和set_diff。在通過一些方法（例如prob_diff = rand(net.blobs('prob').shape);）產生輸出blobs的梯度後，你可以運行：

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">res = <span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>backward(<span class="hljs-cell" style="box-sizing: border-box;">{prob_diff}</span>);
data_diff = res<span class="hljs-cell" style="box-sizing: border-box;">{<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>}</span>;</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

或者

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>blobs(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'prob'</span>).set_diff(prob_diff);
<span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>backward_prefilled();
data_diff = <span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>blobs(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'data'</span>).get_diff();</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li></ul>

然而，如上的後向計算並不能得到正確的結果，因爲Caffe默認網絡不需要後向計算。爲了獲取正確的後向計算結果，你需要在你的網絡prototxt文件中設置force_backward: true

在完成前向和後向計算之後，你可以獲得中間blobs的data和diff。例如，你可以在前向計算後獲取pool5的特徵。

4.Reshape

假設你想要運行1幅圖像，而不是10幅時：

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span>blobs(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'data'</span>).<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">reshape</span>(<span class="hljs-matrix" style="box-sizing: border-box;">[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">227</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">227</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>]</span>); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">% reshape blob 'data'</span>
<span class="hljs-transposed_variable" style="box-sizing: border-box;">net.</span><span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">reshape</span>();</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

然後，整個網絡就reshape了，此時net.blobs('prob').shape應該是[1000 1];

5.訓練網絡

假設你按照ImageNET Tutorial的方法創建了訓練lmdb和驗證lmdb，產生一個solver並且在ILSVRC 2012 分類數據集上訓練：

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">solver = <span class="hljs-transposed_variable" style="box-sizing: border-box;">caffe.</span>Solver(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'./models/bvlc_reference_caffenet/solver.prototxt'</span>);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

這樣可以創建一個solver對象：

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">  Solver with <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">properties</span>:

          net: <span class="hljs-matrix" style="box-sizing: border-box;">[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>x1 caffe.Net]</span>
    test_nets: <span class="hljs-matrix" style="box-sizing: border-box;">[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>x1 caffe.Net]</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul>

訓練代碼：

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-transposed_variable" style="box-sizing: border-box;">solver.</span>solve();</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

如果只想訓練迭代1000次：

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-transposed_variable" style="box-sizing: border-box;">solver.</span>step(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1000</span>);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

來獲取迭代數量：

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">iter = <span class="hljs-transposed_variable" style="box-sizing: border-box;">solver.</span>iter();</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

來獲取這個網絡：

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">train_net = <span class="hljs-transposed_variable" style="box-sizing: border-box;">solver.</span>net;
test_net = <span class="hljs-transposed_variable" style="box-sizing: border-box;">solver.</span>test_nets(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

假設從一個snapshot中恢復網絡訓練：

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-transposed_variable" style="box-sizing: border-box;">solver.</span>restore(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'your_snapshot.solverstate'</span>);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

6.輸入和輸出

caffe.io類提供了基本的輸入函數load_image和read_mean。例如，讀取ILSVRC 2012 mean文件（假設你已經通過運行./data/ilsvrc12/get_ilsvrc_aux.sh下載imagenet例程輔助文件）

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">mean_data = <span class="hljs-transposed_variable" style="box-sizing: border-box;">caffe.</span><span class="hljs-transposed_variable" style="box-sizing: border-box;">io.</span>read_mean(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'./data/ilsvrc12/imagenet_mean.binaryproto'</span>);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

爲了讀取Caffe例程圖片，並且resize到[width, height]，且假設width = 256; height = 256;

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">im_data = <span class="hljs-transposed_variable" style="box-sizing: border-box;">caffe.</span><span class="hljs-transposed_variable" style="box-sizing: border-box;">io.</span>load_image(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'./examples/images/cat.jpg'</span>);
im_data = imresize(im_data, <span class="hljs-matrix" style="box-sizing: border-box;">[width, height]</span>); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">% resize using Matlab's imresize</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

注意：width是最快的維度，通道爲BGR，與Matlab存取圖片的一般方式不一樣。如果你不想要使用caffe.io.load_image，且想自己導入一幅圖片：

<code class="language-matlab hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">im_data = imread(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'./examples/images/cat.jpg'</span>); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">% read image</span>
im_data = im_data(:, :, <span class="hljs-matrix" style="box-sizing: border-box;">[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>]</span>); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">% convert from RGB to BGR</span>
im_data = <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">permute</span>(im_data, <span class="hljs-matrix" style="box-sizing: border-box;">[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>]</span>); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">% permute width and height</span>
im_data = single(im_data); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">% convert to single precision</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul>

你也可以看一下caffe/matlab/demo/classification_demo.m文件，瞭解如何將輸入圖片crop成多個輸入塊。

你可以查看caffe/matlab/hdf5creation，瞭解如何通過Matlab讀和寫HDF5數據。但不提供額外的數據輸出函數，因爲在Matlab本身已經具有了強大的功能。

7.清除nets和solvers

調用caffe.reset_all()來清理你所創建的所有的solvers，和stand-alone nets。