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title="Permalink to this headline">¶</a></h1> +<p>An utility model for image augmentation.</p> +<p>Example usage:</p> +<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">singa</span> <span class="kn">import</span> <span class="n">image_tool</span> + +<span class="n">tool</span> <span class="o">=</span> <span class="n">image_tool</span><span class="o">.</span><span class="n">ImageTool</span><span class="p">()</span> +<span class="n">imgs</span> <span class="o">=</span> <span class="n">tool</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="s1">'input.png'</span><span class="p">)</span><span class="o">.</span> <span class="n">resize_by_list</span><span class="p">([</span><span class="mi">112</span><span class="p">])</span><span class="o">.</span><span class="n">crop5</span><span class="p">((</span><span class="mi">96</span><span class="p">,</span> <span class="mi">96</span><span class="p">),</span> <span class="mi">5</span><span class="p">)</span><span class="o">.</span><span class="n">enhance</span><span class="p">()</span><span class="o">.</span><span class="n">flip</span><span class="p">()</span><span class="o">.</span><span class="n">get</span><span class="p">()</span> +<span class="k">for</span> <span class="n">idx</span><span class="p">,</span> <span class="n">img</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">imgs</span><span class="p">):</span> + <span class="n">img</span><span class="o">.</span><span class="n">save</span><span class="p">(</span><span class="s1">'</span><span class="si">%d</span><span class="s1">.png'</span> <span class="o">%</span> <span class="n">idx</span><span class="p">)</span> +</pre></div> +</div> +<dl class="class"> +<dt id="singa.image_tool.ImageTool"> +<em class="property">class </em><code class="descclassname">singa.image_tool.</code><code class="descname">ImageTool</code><a class="headerlink" href="#singa.image_tool.ImageTool" title="Permalink to this definition">¶</a></dt> +<dd><p>A tool for image augmentation.</p> +<p>For operations with inplace=True, the returned value is the ImageTool +instance self, which is for chaining multiple operations; Otherwise, the +preprocessed images would be returned.</p> +<p>For operations that has countable pre-processing cases, argument num_case +could be set to decide the number of pre-processing cases to apply. +Typically, it is set to 1 for training phases and to the max for test +phases.</p> +<dl class="method"> +<dt id="singa.image_tool.ImageTool.color_cast"> +<code class="descname">color_cast</code><span class="sig-paren">(</span><em>offset=20</em>, <em>inplace=True</em><span class="sig-paren">)</span><a class="headerlink" href="#singa.image_tool.ImageTool.color_cast" title="Permalink to this definition">¶</a></dt> +<dd><p>Add a random value from [-offset, offset] to each channel</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple"> +<li><strong>offset</strong> – cast offset, >0 and <255</li> +<li><strong>inplace</strong> – inplace imgs or not ( return new_imgs)</li> +</ul> +</td> +</tr> +</tbody> +</table> +</dd></dl> + +<dl class="method"> +<dt id="singa.image_tool.ImageTool.crop3"> +<code class="descname">crop3</code><span class="sig-paren">(</span><em>patch</em>, <em>num_case=1</em>, <em>inplace=True</em><span class="sig-paren">)</span><a class="headerlink" href="#singa.image_tool.ImageTool.crop3" title="Permalink to this definition">¶</a></dt> +<dd><p>Crop a max square patch of the input image at given position and +scale it into given size.</p> +<p>According to img size, crop position could be either +(left, center, right) or (top, middle, bottom).</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple"> +<li><strong>patch</strong> (<em>tuple</em>) – the width and height the output image</li> +<li><strong>num_case</strong> – num of cases, must be in [1,3]</li> +<li><strong>inplace</strong> – inplace imgs or not ( return new_imgs)</li> +</ul> +</td> +</tr> +</tbody> +</table> +</dd></dl> + +<dl class="method"> +<dt id="singa.image_tool.ImageTool.crop5"> +<code class="descname">crop5</code><span class="sig-paren">(</span><em>patch</em>, <em>num_case=1</em>, <em>inplace=True</em><span class="sig-paren">)</span><a class="headerlink" href="#singa.image_tool.ImageTool.crop5" title="Permalink to this definition">¶</a></dt> +<dd><p>Crop at positions from [left_top, left_bottom, right_top, +right_bottom, and center].</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple"> +<li><strong>patch</strong> (<em>tuple</em>) – width and height of the result image.</li> +<li><strong>num_case</strong> – num of cases, must be in [1,5]</li> +<li><strong>inplace</strong> – inplace imgs or not ( return new_imgs)</li> +</ul> +</td> +</tr> +</tbody> +</table> +</dd></dl> + +<dl class="method"> +<dt id="singa.image_tool.ImageTool.crop8"> +<code class="descname">crop8</code><span class="sig-paren">(</span><em>patch</em>, <em>num_case=1</em>, <em>inplace=True</em><span class="sig-paren">)</span><a class="headerlink" href="#singa.image_tool.ImageTool.crop8" title="Permalink to this definition">¶</a></dt> +<dd><p>This is a union of patch_5 and patch_and_scale.</p> +<p>You can follow this example to union any num of cases of imgtool methods</p> +</dd></dl> + +<dl class="method"> +<dt id="singa.image_tool.ImageTool.enhance"> +<code class="descname">enhance</code><span class="sig-paren">(</span><em>scale=0.2</em>, <em>inplace=True</em><span class="sig-paren">)</span><a class="headerlink" href="#singa.image_tool.ImageTool.enhance" title="Permalink to this definition">¶</a></dt> +<dd><p>Apply random enhancement for Color,Contrast,Brightness,Sharpness.</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple"> +<li><strong>scale</strong> (<em>float</em>) – enhancement degree is from [1-scale, 1+scale]</li> +<li><strong>inplace</strong> – inplace imgs or not ( return new_imgs)</li> +</ul> +</td> +</tr> +</tbody> +</table> +</dd></dl> + +<dl class="method"> +<dt id="singa.image_tool.ImageTool.flip"> +<code class="descname">flip</code><span class="sig-paren">(</span><em>num_case=1</em>, <em>inplace=True</em><span class="sig-paren">)</span><a class="headerlink" href="#singa.image_tool.ImageTool.flip" title="Permalink to this definition">¶</a></dt> +<dd><p>Randomly flip a img left to right.</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple"> +<li><strong>num_case</strong> – num of cases, must be in {1,2}; if 2, then add the orignal +and flipped img</li> +<li><strong>inplace</strong> – inplace imgs or not (return new_imgs)</li> +</ul> +</td> +</tr> +</tbody> +</table> +</dd></dl> + +<dl class="method"> +<dt id="singa.image_tool.ImageTool.num_augmentation"> +<code class="descname">num_augmentation</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#singa.image_tool.ImageTool.num_augmentation" title="Permalink to this definition">¶</a></dt> +<dd><p>Return the total number of augmentations to each image</p> +</dd></dl> + +<dl class="method"> +<dt id="singa.image_tool.ImageTool.random_crop"> +<code class="descname">random_crop</code><span class="sig-paren">(</span><em>patch</em>, <em>inplace=True</em><span class="sig-paren">)</span><a class="headerlink" href="#singa.image_tool.ImageTool.random_crop" title="Permalink to this definition">¶</a></dt> +<dd><p>Crop the image at random offset to get a patch of the given size.</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple"> +<li><strong>patch</strong> (<em>tuple</em>) – width and height of the patch</li> +<li><strong>inplace</strong> (<em>Boolean</em>) – replace the internal images list with the patches +if True; otherwise, return the patches.</li> +</ul> +</td> +</tr> +</tbody> +</table> +</dd></dl> + +<dl class="method"> +<dt id="singa.image_tool.ImageTool.resize_by_list"> +<code class="descname">resize_by_list</code><span class="sig-paren">(</span><em>size_list</em>, <em>num_case=1</em>, <em>inplace=True</em><span class="sig-paren">)</span><a class="headerlink" href="#singa.image_tool.ImageTool.resize_by_list" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple"> +<li><strong>num_case</strong> – num of resize cases, must be <= the length of size_list</li> +<li><strong>inplace</strong> – inplace imgs or not ( return new_imgs)</li> +</ul> +</td> +</tr> +</tbody> +</table> +</dd></dl> + +<dl class="method"> +<dt id="singa.image_tool.ImageTool.resize_by_range"> +<code class="descname">resize_by_range</code><span class="sig-paren">(</span><em>rng</em>, <em>inplace=True</em><span class="sig-paren">)</span><a class="headerlink" href="#singa.image_tool.ImageTool.resize_by_range" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple"> +<li><strong>rng</strong> – a tuple (begin,end), include begin, exclude end</li> +<li><strong>inplace</strong> – inplace imgs or not ( return new_imgs)</li> +</ul> +</td> +</tr> +</tbody> +</table> +</dd></dl> + +<dl class="method"> +<dt id="singa.image_tool.ImageTool.rotate_by_list"> +<code class="descname">rotate_by_list</code><span class="sig-paren">(</span><em>angle_list</em>, <em>num_case=1</em>, <em>inplace=True</em><span class="sig-paren">)</span><a class="headerlink" href="#singa.image_tool.ImageTool.rotate_by_list" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple"> +<li><strong>num_case</strong> – num of rotate cases, must be <= the length of angle_list</li> +<li><strong>inplace</strong> – inplace imgs or not ( return new_imgs)</li> +</ul> +</td> +</tr> +</tbody> +</table> +</dd></dl> + +<dl class="method"> +<dt id="singa.image_tool.ImageTool.rotate_by_range"> +<code class="descname">rotate_by_range</code><span class="sig-paren">(</span><em>rng</em>, <em>inplace=True</em><span class="sig-paren">)</span><a class="headerlink" href="#singa.image_tool.ImageTool.rotate_by_range" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple"> +<li><strong>rng</strong> – a tuple (begin,end) in degree, include begin, exclude end</li> +<li><strong>inplace</strong> – inplace imgs or not ( return new_imgs)</li> +</ul> +</td> +</tr> +</tbody> +</table> +</dd></dl> + +</dd></dl> + +<dl class="function"> +<dt id="singa.image_tool.color_cast"> +<code class="descclassname">singa.image_tool.</code><code class="descname">color_cast</code><span class="sig-paren">(</span><em>img</em>, <em>offset</em><span class="sig-paren">)</span><a class="headerlink" href="#singa.image_tool.color_cast" title="Permalink to this definition">¶</a></dt> +<dd><p>Add a random value from [-offset, offset] to each channel</p> +</dd></dl> + +<dl class="function"> +<dt id="singa.image_tool.crop"> +<code class="descclassname">singa.image_tool.</code><code class="descname">crop</code><span class="sig-paren">(</span><em>img</em>, <em>patch</em>, <em>position</em><span class="sig-paren">)</span><a class="headerlink" href="#singa.image_tool.crop" title="Permalink to this definition">¶</a></dt> +<dd><p>Crop the input image into given size at given position.</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple"> +<li><strong>patch</strong> (<em>tuple</em>) – width and height of the patch</li> +<li><strong>position</strong> (<em>list(str</em>) – left_top, left_bottom, right_top, right_bottom</li> +<li><strong>center.</strong> (<em>and</em>) – </li> +</ul> +</td> +</tr> +</tbody> +</table> +</dd></dl> + +<dl class="function"> +<dt id="singa.image_tool.crop_and_resize"> +<code class="descclassname">singa.image_tool.</code><code class="descname">crop_and_resize</code><span class="sig-paren">(</span><em>img</em>, <em>patch</em>, <em>position</em><span class="sig-paren">)</span><a class="headerlink" href="#singa.image_tool.crop_and_resize" title="Permalink to this definition">¶</a></dt> +<dd><p>Crop a max square patch of the input image at given position and resize +it into given size.</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple"> +<li><strong>patch</strong> (<em>tuple</em>) – width, height</li> +<li><strong>position</strong> (<em>list(str</em>) – left, center, right, top, middle, bottom.</li> +</ul> +</td> +</tr> +</tbody> +</table> +</dd></dl> + +<dl class="function"> +<dt id="singa.image_tool.enhance"> +<code class="descclassname">singa.image_tool.</code><code class="descname">enhance</code><span class="sig-paren">(</span><em>img</em>, <em>scale</em><span class="sig-paren">)</span><a class="headerlink" href="#singa.image_tool.enhance" title="Permalink to this definition">¶</a></dt> +<dd><p>Apply random enhancement for Color,Contrast,Brightness,Sharpness.</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>scale</strong> (<em>float</em>) – enhancement degree is from [1-scale, 1+scale]</td> +</tr> +</tbody> +</table> +</dd></dl> + +<dl class="function"> +<dt id="singa.image_tool.load_img"> +<code class="descclassname">singa.image_tool.</code><code class="descname">load_img</code><span class="sig-paren">(</span><em>path</em>, <em>grayscale=False</em><span class="sig-paren">)</span><a class="headerlink" href="#singa.image_tool.load_img" title="Permalink to this definition">¶</a></dt> +<dd><p>Read the image from a give path</p> +</dd></dl> + +<dl class="function"> +<dt id="singa.image_tool.resize"> +<code class="descclassname">singa.image_tool.</code><code class="descname">resize</code><span class="sig-paren">(</span><em>img</em>, <em>small_size</em><span class="sig-paren">)</span><a class="headerlink" href="#singa.image_tool.resize" title="Permalink to this definition">¶</a></dt> +<dd><p>Resize the image to make the smaller side be at the given size</p> +</dd></dl> + +</div> + + + </div> + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="snapshot.html" class="btn btn-neutral float-right" title="Snapshot" accesskey="n">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="data.html" 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itemscope="itemscope" itemtype="http://schema.org/Article";> + <div itemprop="articleBody"> + + <div class="section" id="initializer"> +<h1>Initializer<a class="headerlink" href="#initializer" title="Permalink to this headline">¶</a></h1> +<div class="section" id="module-singa.initializer"> +<span id="python-api"></span><h2>Python API<a class="headerlink" href="#module-singa.initializer" title="Permalink to this headline">¶</a></h2> +<p>Popular initialization methods for parameter values (Tensor objects).</p> +<p>Example usages:</p> +<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">singa</span> <span class="kn">import</span> <span class="n">tensor</span> +<span class="kn">from</span> <span class="nn">singa</span> <span class="kn">import</span> <span class="n">initializer</span> + +<span class="n">x</span> <span class="o">=</span> <span class="n">tensor</span><span class="o">.</span><span class="n">Tensor</span><span class="p">((</span><span class="mi">3</span><span class="p">,</span> <span class="mi">5</span><span class="p">))</span> +<span class="n">initializer</span><span class="o">.</span><span class="n">uniform</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">5</span><span class="p">)</span> <span class="c1"># use both fan_in and fan_out</span> +<span class="n">initializer</span><span class="o">.</span><span class="n">uniform</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span> <span class="c1"># use only fan_in</span> +</pre></div> +</div> +<dl class="function"> +<dt id="singa.initializer.uniform"> +<code class="descclassname">singa.initializer.</code><code class="descname">uniform</code><span class="sig-paren">(</span><em>t</em>, <em>fan_in=0</em>, <em>fan_out=0</em><span class="sig-paren">)</span><a class="headerlink" href="#singa.initializer.uniform" title="Permalink to this definition">¶</a></dt> +<dd><p>Initialize the values of the input tensor following a uniform +distribution with specific bounds.</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple"> +<li><strong>fan_in</strong> (<em>int</em>) – for the weight Tensor of a convolution layer, +fan_in = nb_channel * kh * kw; for dense layer, +fan_in = input_feature_length</li> +<li><strong>fan_out</strong> (<em>int</em>) – for the convolution layer weight Tensor, +fan_out = nb_filter * kh * kw; for the weight Tensor of a dense +layer, fan_out = output_feature_length</li> +</ul> +</td> +</tr> +</tbody> +</table> +<p>Ref: [Bengio and Glorot 2010]: Understanding the difficulty of +training deep feedforward neuralnetworks.</p> +</dd></dl> + +<dl class="function"> +<dt id="singa.initializer.gaussian"> +<code class="descclassname">singa.initializer.</code><code class="descname">gaussian</code><span class="sig-paren">(</span><em>t</em>, <em>fan_in=0</em>, <em>fan_out=0</em><span class="sig-paren">)</span><a class="headerlink" href="#singa.initializer.gaussian" title="Permalink to this definition">¶</a></dt> +<dd><p>Initialize the values of the input tensor following a Gaussian +distribution with specific std.</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple"> +<li><strong>fan_in</strong> (<em>int</em>) – for the weight Tensor of a convolution layer, +fan_in = nb_channel * kh * kw; for dense layer, +fan_in = input_feature_length</li> +<li><strong>fan_out</strong> (<em>int</em>) – for the convolution layer weight Tensor, +fan_out = nb_filter * kh * kw; for the weight Tensor of a dense +layer, fan_out = output_feature_length</li> +</ul> +</td> +</tr> +</tbody> +</table> +<p>Ref Kaiming He, Xiangyu Zhang, Shaoqing Ren, Jian Sun: Delving Deep into +Rectifiers: Surpassing Human-Level Performance on ImageNet Classification</p> +</dd></dl> + +</div> +<div class="section" id="cpp-api"> +<h2>CPP API<a class="headerlink" href="#cpp-api" title="Permalink to this headline">¶</a></h2> +</div> +</div> + + + </div> + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="loss.html" class="btn btn-neutral float-right" title="Loss" accesskey="n">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="net.html" class="btn btn-neutral" title="FeedForward Net" accesskey="p"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div role="contentinfo"> + <p> 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