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  <div class="section" id="pydataprovider2">
<span id="api-pydataprovider2"></span><h1>PyDataProvider2<a class="headerlink" href="#pydataprovider2" title="Permalink to this headline">¶</a></h1>
<p>We highly recommand users to use PyDataProvider2 to provide training or testing
data to PaddlePaddle. The user only needs to focus on how to read a single
sample from the original data file by using PyDataProvider2, leaving all of the
trivial work, including, transfering data into cpu/gpu memory, shuffle, binary
serialization to PyDataProvider2. PyDataProvider2 uses multithreading and a
fanscinating but simple cache strategy to optimize the efficiency of the data
providing process.</p>
<div class="section" id="dataprovider-for-the-non-sequential-model">
<h2>DataProvider for the non-sequential model<a class="headerlink" href="#dataprovider-for-the-non-sequential-model" title="Permalink to this headline">¶</a></h2>
<p>Here we use the MNIST handwriting recognition data as an example to illustrate
how to write a simple PyDataProvider.</p>
<p>MNIST is a handwriting classification data set. It contains 70,000 digital
grayscale images. Labels of the training sample range from 0 to 9. All the
images have been size-normalized and centered into images with the same size
of 28 x 28 pixels.</p>
<p>A small part of the original data as an example is shown as below:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="mi">5</span><span class="p">;</span><span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">0.215686</span> <span class="mf">0.533333</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">0.67451</span> <span class="mf">0.992157</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">0.070588</span> <span class="mf">0.886275</span> <span class="mf">0.992157</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">0.192157</span> <span class="mf">0.070588</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">0.670588</span> <span class="mf">0.992157</span> <span class="mf">0.992157</span> <span 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class="mi">0</span> <span class="mi">0</span> <span class="mf">0.811765</span> <span class="mf">0.694118</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">0.811765</span> <span class="mf">0.694118</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">0.811765</span> <span class="mf">0.694118</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">0.184314</span> <span class="mf">0.992157</span> <span class="mf">0.694118</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">0.192157</span> <span class="mf">0.996078</span> <span class="mf">0.384314</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">0.454902</span> <span class="mf">0.980392</span> <span class="mf">0.219608</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">0.564706</span> <span class="mf">0.941176</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">0.588235</span> <span class="mf">0.776471</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">0.945098</span> <span class="mf">0.560784</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">0.054902</span> <span class="mf">0.952941</span> <span class="mf">0.356863</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">0.337255</span> <span class="mf">0.917647</span> <span class="mf">0.109804</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">0.698039</span> <span class="mf">0.701961</span> <span class="mf">0.019608</span> <span class="mf">0.4</span> <span class="mf">0.662745</span> <span class="mf">0.662745</span> <span class="mf">0.662745</span> <span class="mf">0.662745</span> <span class="mf">0.662745</span> <span class="mf">0.662745</span> <span class="mf">0.662745</span> <span class="mf">0.376471</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">0.090196</span> <span class="mf">0.639216</span> <span class="mf">0.972549</span> <span class="mf">0.945098</span> <span class="mf">0.913725</span> <span class="mf">0.996078</span> <span class="mf">0.996078</span> <span class="mf">0.996078</span> <span class="mf">0.996078</span> <span class="mi">1</span> <span class="mf">0.996078</span> <span class="mf">0.996078</span> <span class="mi">1</span> <span class="mf">0.996078</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">0.007843</span> <span class="mf">0.105882</span> <span class="mf">0.717647</span> <span class="mf">0.776471</span> <span class="mf">0.905882</span> <span class="mf">0.996078</span> <span class="mf">0.996078</span> <span class="mf">0.988235</span> <span class="mf">0.980392</span> <span class="mf">0.862745</span> <span class="mf">0.537255</span> <span class="mf">0.223529</span> <span class="mf">0.223529</span> <span class="mf">0.368627</span> <span class="mf">0.376471</span> <span class="mf">0.6</span> <span class="mf">0.6</span> <span class="mf">0.6</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">0.262745</span> <span class="mf">0.470588</span> <span class="mf">0.6</span> <span class="mf">0.996078</span> <span class="mf">0.996078</span> <span class="mf">0.996078</span> <span class="mf">0.996078</span> <span class="mf">0.847059</span> <span class="mf">0.356863</span> <span class="mf">0.156863</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">0.909804</span> <span class="mf">0.705882</span> <span class="mf">0.823529</span> <span class="mf">0.635294</span> <span class="mf">0.490196</span> <span class="mf">0.219608</span> <span class="mf">0.113725</span> <span class="mf">0.062745</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">0.152941</span> <span class="mf">0.152941</span> <span class="mf">0.156863</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span><span class="p">;</span>
</pre></div>
</div>
<p>Each line of the data contains two parts, separated by <code class="code docutils literal"><span class="pre">;</span></code>. The first part is
label of an image. The second part contains 28x28 pixel float values.</p>
<p>Just write path of the above data into train.list. It looks like this:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">mnist_train</span><span class="o">.</span><span class="n">txt</span>
</pre></div>
</div>
<p>The corresponding dataprovider is shown as below:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">paddle.trainer.PyDataProvider2</span> <span class="k">import</span> <span class="o">*</span>


<span class="c1"># Define a py data provider</span>
<span class="nd">@provider</span><span class="p">(</span>
    <span class="n">input_types</span><span class="o">=</span><span class="p">{</span><span class="s1">&#39;pixel&#39;</span><span class="p">:</span> <span class="n">dense_vector</span><span class="p">(</span><span class="mi">28</span> <span class="o">*</span> <span class="mi">28</span><span class="p">),</span>
                 <span class="s1">&#39;label&#39;</span><span class="p">:</span> <span class="n">integer_value</span><span class="p">(</span><span class="mi">10</span><span class="p">)})</span>
<span class="k">def</span> <span class="nf">process</span><span class="p">(</span><span class="n">settings</span><span class="p">,</span> <span class="n">filename</span><span class="p">):</span>  <span class="c1"># settings is not used currently.</span>
    <span class="n">f</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="s1">&#39;r&#39;</span><span class="p">)</span>  <span class="c1"># open one of training file</span>

    <span class="k">for</span> <span class="n">line</span> <span class="ow">in</span> <span class="n">f</span><span class="p">:</span>  <span class="c1"># read each line</span>
        <span class="n">label</span><span class="p">,</span> <span class="n">pixel</span> <span class="o">=</span> <span class="n">line</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s1">&#39;;&#39;</span><span class="p">)</span>

        <span class="c1"># get features and label</span>
        <span class="n">pixels_str</span> <span class="o">=</span> <span class="n">pixel</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s1">&#39; &#39;</span><span class="p">)</span>

        <span class="n">pixels_float</span> <span class="o">=</span> <span class="p">[]</span>
        <span class="k">for</span> <span class="n">each_pixel_str</span> <span class="ow">in</span> <span class="n">pixels_str</span><span class="p">:</span>
            <span class="n">pixels_float</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="nb">float</span><span class="p">(</span><span class="n">each_pixel_str</span><span class="p">))</span>

        <span class="c1"># give data to paddle.</span>
        <span class="k">yield</span> <span class="p">{</span><span class="s2">&quot;pixel&quot;</span><span class="p">:</span> <span class="n">pixels_float</span><span class="p">,</span> <span class="s1">&#39;label&#39;</span><span class="p">:</span> <span class="nb">int</span><span class="p">(</span><span class="n">label</span><span class="p">)}</span>

    <span class="n">f</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>  <span class="c1"># close file</span>
</pre></div>
</div>
<p>The first line imports PyDataProvider2 package.
The main function is the process function, that has two parameters.
The first parameter is the settings, which is not used in this example.
The second parameter is the filename, that is exactly each line of train.list.
This parameter is passed to the process function by PaddlePaddle.</p>
<p><code class="code docutils literal"><span class="pre">&#64;provider</span></code> is a Python
<a class="reference external" href="http://www.learnpython.org/en/Decorators">Decorator</a> .
It sets some properties to DataProvider, and constructs a real PaddlePaddle
DataProvider from a very simple user implemented python function. It does not
matter if you are not familiar with <a class="reference external" href="http://www.learnpython.org/en/Decorators">Decorator</a>. You can keep it simple by
just taking <code class="code docutils literal"><span class="pre">&#64;provider</span></code> as a fixed mark above the provider function you
implemented.</p>
<p><a class="reference internal" href="#input-types">input_types</a> defines the data format that a DataProvider returns.
In this example, it is set to a 28x28-dimensional dense vector and an integer
scalar, whose value ranges from 0 to 9.
<a class="reference internal" href="#input-types">input_types</a> can be set to several kinds of input formats, please refer to the
document of <a class="reference internal" href="#input-types">input_types</a> for more details.</p>
<p>The process method is the core part to construct a real DataProvider in
PaddlePaddle. It implements how to open the text file, how to read one sample
from the original text file, convert them into <a class="reference internal" href="#input-types">input_types</a>, and give them
back to PaddlePaddle process at line 23.
Note that data yielded by the process function must follow the same order that
<a class="reference internal" href="#input-types">input_types</a> are defined.</p>
<p>With the help of PyDataProvider2, user can focus on how to generate ONE traning
sample by using keywords <code class="code docutils literal"><span class="pre">yield</span></code>.
<code class="code docutils literal"><span class="pre">yield</span></code> is a python keyword, and a concept related to it includes
<code class="code docutils literal"><span class="pre">generator</span></code>.</p>
<p>Only a few lines of codes need to be added into the training configuration file,
you can take this as an example.</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">paddle.trainer_config_helpers</span> <span class="k">import</span> <span class="o">*</span>

<span class="n">define_py_data_sources2</span><span class="p">(</span>
    <span class="n">train_list</span><span class="o">=</span><span class="s1">&#39;train.list&#39;</span><span class="p">,</span>
    <span class="n">test_list</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
    <span class="n">module</span><span class="o">=</span><span class="s1">&#39;mnist_provider&#39;</span><span class="p">,</span>
    <span class="n">obj</span><span class="o">=</span><span class="s1">&#39;process&#39;</span><span class="p">)</span>

<span class="n">img</span> <span class="o">=</span> <span class="n">data_layer</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s1">&#39;pixel&#39;</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="mi">784</span><span class="p">)</span>
<span class="n">label</span> <span class="o">=</span> <span class="n">data_layer</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s1">&#39;label&#39;</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="mi">10</span><span class="p">)</span>
</pre></div>
</div>
<p>Here we specify training data by <code class="code docutils literal"><span class="pre">train.list</span></code>, and no testing data is specified.
The method which actually provide data is <code class="code docutils literal"><span class="pre">process</span></code>.</p>
<p>User also can use another style to provide data, which defines the
<code class="code docutils literal"><span class="pre">data_layer</span></code>&#8216;s name explicitly when <cite>yield</cite>. For example,
the <code class="code docutils literal"><span class="pre">dataprovider</span></code> is shown as below.</p>
<div class="highlight-default"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24</pre></div></td><td class="code"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">paddle.trainer.PyDataProvider2</span> <span class="k">import</span> <span class="o">*</span>


<span class="c1"># Define a py data provider</span>
<span class="nd">@provider</span><span class="p">(</span>
    <span class="n">input_types</span><span class="o">=</span><span class="p">{</span><span class="s1">&#39;pixel&#39;</span><span class="p">:</span> <span class="n">dense_vector</span><span class="p">(</span><span class="mi">28</span> <span class="o">*</span> <span class="mi">28</span><span class="p">),</span>
                 <span class="s1">&#39;label&#39;</span><span class="p">:</span> <span class="n">integer_value</span><span class="p">(</span><span class="mi">10</span><span class="p">)})</span>
<span class="k">def</span> <span class="nf">process</span><span class="p">(</span><span class="n">settings</span><span class="p">,</span> <span class="n">filename</span><span class="p">):</span>  <span class="c1"># settings is not used currently.</span>
    <span class="n">f</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="s1">&#39;r&#39;</span><span class="p">)</span>  <span class="c1"># open one of training file</span>

    <span class="k">for</span> <span class="n">line</span> <span class="ow">in</span> <span class="n">f</span><span class="p">:</span>  <span class="c1"># read each line</span>
        <span class="n">label</span><span class="p">,</span> <span class="n">pixel</span> <span class="o">=</span> <span class="n">line</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s1">&#39;;&#39;</span><span class="p">)</span>

        <span class="c1"># get features and label</span>
        <span class="n">pixels_str</span> <span class="o">=</span> <span class="n">pixel</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s1">&#39; &#39;</span><span class="p">)</span>

        <span class="n">pixels_float</span> <span class="o">=</span> <span class="p">[]</span>
        <span class="k">for</span> <span class="n">each_pixel_str</span> <span class="ow">in</span> <span class="n">pixels_str</span><span class="p">:</span>
            <span class="n">pixels_float</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="nb">float</span><span class="p">(</span><span class="n">each_pixel_str</span><span class="p">))</span>

        <span class="c1"># give data to paddle.</span>
        <span class="k">yield</span> <span class="p">{</span><span class="s2">&quot;pixel&quot;</span><span class="p">:</span> <span class="n">pixels_float</span><span class="p">,</span> <span class="s1">&#39;label&#39;</span><span class="p">:</span> <span class="nb">int</span><span class="p">(</span><span class="n">label</span><span class="p">)}</span>

    <span class="n">f</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>  <span class="c1"># close file</span>
</pre></div>
</td></tr></table></div>
<p>If user did&#8217;t give the <code class="code docutils literal"><span class="pre">data_layer</span></code>&#8216;s name, PaddlePaddle will use
the order of <code class="code docutils literal"><span class="pre">data_layer</span></code> definition roughly to determine which feature to
which <code class="code docutils literal"><span class="pre">data_layer</span></code>. This order may be not correct, so TO DEFINE THE
<code class="code docutils literal"><span class="pre">data_layer</span></code>&#8216;s NAMES EXPLICITLY IS THE RECOMMANDED WAY TO PROVIDER DATA.</p>
<p>Now, this simple example of using PyDataProvider is finished.
The only thing that the user should know is how to generte <strong>one sample</strong> from
<strong>one data file</strong>.
And PaddlePadle will do all of the rest things:</p>
<ul class="simple">
<li>Form a training batch</li>
<li>Shuffle the training data</li>
<li>Read data with multithreading</li>
<li>Cache the training data (Optional)</li>
<li>CPU-&gt; GPU double buffering.</li>
</ul>
<p>Is this cool?</p>
</div>
<div class="section" id="dataprovider-for-the-sequential-model">
<span id="api-pydataprovider2-sequential-model"></span><h2>DataProvider for the sequential model<a class="headerlink" href="#dataprovider-for-the-sequential-model" title="Permalink to this headline">¶</a></h2>
<p>A sequence model takes sequences as its input. A sequence is made up of several
timesteps. The so-called timestep, is not necessary to have something to do
with time. It can also be explained to that the order of data are taken into
consideration into model design and training.
For example, the sentence can be interpreted as a kind of sequence data in NLP
tasks.</p>
<p>Here is an example on data proivider for English sentiment classification data.
The original input data are simple English text, labeled into positive or
negative sentiment (marked by 0 and 1 respectively).</p>
<p>A small part of the original data as an example can be found in the path below:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="mi">0</span>       <span class="n">I</span> <span class="n">saw</span> <span class="n">this</span> <span class="n">movie</span> <span class="n">at</span> <span class="n">the</span> <span class="n">AFI</span> <span class="n">Dallas</span> <span class="n">festival</span> <span class="o">.</span> <span class="n">It</span> <span class="nb">all</span> <span class="n">takes</span> <span class="n">place</span> <span class="n">at</span> <span class="n">a</span> <span class="n">lake</span> <span class="n">house</span> <span class="ow">and</span> <span class="n">it</span> <span class="n">looks</span> <span class="n">wonderful</span> <span class="o">.</span>
<span class="mi">1</span>       <span class="n">This</span> <span class="n">documentary</span> <span class="n">makes</span> <span class="n">you</span> <span class="n">travel</span> <span class="nb">all</span> <span class="n">around</span> <span class="n">the</span> <span class="n">globe</span> <span class="o">.</span> <span class="n">It</span> <span class="n">contains</span> <span class="n">rare</span> <span class="ow">and</span> <span class="n">stunning</span> <span class="n">sequels</span> <span class="kn">from</span> <span class="nn">the</span> <span class="n">wilderness</span> <span class="o">.</span>
<span class="o">...</span>
</pre></div>
</div>
<p>The corresponding data provider can be found in the path below:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">paddle.trainer.PyDataProvider2</span> <span class="k">import</span> <span class="o">*</span>


<span class="k">def</span> <span class="nf">on_init</span><span class="p">(</span><span class="n">settings</span><span class="p">,</span> <span class="n">dictionary</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
    <span class="c1"># on_init will invoke when data provider is initialized. The dictionary</span>
    <span class="c1"># is passed from trainer_config, and is a dict object with type</span>
    <span class="c1"># (word string =&gt; word id).</span>

    <span class="c1"># set input types in runtime. It will do the same thing as</span>
    <span class="c1"># @provider(input_types) will do, but it is set dynamically during runtime.</span>
    <span class="n">settings</span><span class="o">.</span><span class="n">input_types</span> <span class="o">=</span> <span class="p">{</span>
        <span class="c1"># The text is a sequence of integer values, and each value is a word id.</span>
        <span class="c1"># The whole sequence is the sentences that we want to predict its</span>
        <span class="c1"># sentimental.</span>
        <span class="s1">&#39;data&#39;</span><span class="p">:</span> <span class="n">integer_value_sequence</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">dictionary</span><span class="p">)),</span>  <span class="c1"># text input</span>
        <span class="s1">&#39;label&#39;</span><span class="p">:</span> <span class="n">integer_value</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>  <span class="c1"># label positive/negative</span>
    <span class="p">}</span>

    <span class="c1"># save dictionary as settings.dictionary. </span>
    <span class="c1"># It will be used in process method.</span>
    <span class="n">settings</span><span class="o">.</span><span class="n">dictionary</span> <span class="o">=</span> <span class="n">dictionary</span>


<span class="nd">@provider</span><span class="p">(</span><span class="n">init_hook</span><span class="o">=</span><span class="n">on_init</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">process</span><span class="p">(</span><span class="n">settings</span><span class="p">,</span> <span class="n">filename</span><span class="p">):</span>
    <span class="n">f</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="s1">&#39;r&#39;</span><span class="p">)</span>

    <span class="k">for</span> <span class="n">line</span> <span class="ow">in</span> <span class="n">f</span><span class="p">:</span>  <span class="c1"># read each line of file</span>
        <span class="n">label</span><span class="p">,</span> <span class="n">sentence</span> <span class="o">=</span> <span class="n">line</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s1">&#39;</span><span class="se">\t</span><span class="s1">&#39;</span><span class="p">)</span>  <span class="c1"># get label and sentence</span>
        <span class="n">words</span> <span class="o">=</span> <span class="n">sentence</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s1">&#39; &#39;</span><span class="p">)</span>  <span class="c1"># get words</span>

        <span class="c1"># convert word string to word id</span>
        <span class="c1"># the word not in dictionary will be ignored.</span>
        <span class="n">word_ids</span> <span class="o">=</span> <span class="p">[]</span>

        <span class="k">for</span> <span class="n">each_word</span> <span class="ow">in</span> <span class="n">words</span><span class="p">:</span>
            <span class="k">if</span> <span class="n">each_word</span> <span class="ow">in</span> <span class="n">settings</span><span class="o">.</span><span class="n">dictionary</span><span class="p">:</span>
                <span class="n">word_ids</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">settings</span><span class="o">.</span><span class="n">dictionary</span><span class="p">[</span><span class="n">each_word</span><span class="p">])</span>

        <span class="c1"># give data to paddle.</span>
        <span class="k">yield</span> <span class="n">word_ids</span><span class="p">,</span> <span class="nb">int</span><span class="p">(</span><span class="n">label</span><span class="p">)</span>

    <span class="n">f</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
</pre></div>
</div>
<p>This data provider for sequential model is a little more complex than that
for MINST dataset.
A new initialization method is introduced here.
The method <code class="code docutils literal"><span class="pre">on_init</span></code> is configured to DataProvider by <code class="code docutils literal"><span class="pre">&#64;provider</span></code>&#8216;s
<code class="code docutils literal"><span class="pre">init_hook</span></code> parameter, and it will be invoked once DataProvider is
initialized. The <code class="code docutils literal"><span class="pre">on_init</span></code> function has the following parameters:</p>
<ul class="simple">
<li>The first parameter is the settings object.</li>
<li>The rest parameters are passed by key word arguments. Some of them are passed
by PaddlePaddle, see reference for <a class="reference internal" href="#init-hook">init_hook</a>.
The <code class="code docutils literal"><span class="pre">dictionary</span></code> object is a python dict object passed from the trainer
configuration file, and it maps word string to word id.</li>
</ul>
<p>To pass these parameters into DataProvider, the following lines should be added
into trainer configuration file.</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">paddle.trainer_config_helpers</span> <span class="k">import</span> <span class="o">*</span>

<span class="n">dictionary</span> <span class="o">=</span> <span class="nb">dict</span><span class="p">()</span>
<span class="o">...</span>  <span class="c1">#  read dictionary from outside</span>

<span class="n">define_py_data_sources2</span><span class="p">(</span>
    <span class="n">train_list</span><span class="o">=</span><span class="s1">&#39;train.list&#39;</span><span class="p">,</span>
    <span class="n">test_list</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
    <span class="n">module</span><span class="o">=</span><span class="s1">&#39;sentimental_provider&#39;</span><span class="p">,</span>
    <span class="n">obj</span><span class="o">=</span><span class="s1">&#39;process&#39;</span><span class="p">,</span>
    <span class="c1"># above codes same as mnist sample.</span>
    <span class="n">args</span><span class="o">=</span><span class="p">{</span>  <span class="c1"># pass to provider.</span>
        <span class="s1">&#39;dictionary&#39;</span><span class="p">:</span> <span class="n">dictionary</span>
    <span class="p">})</span>
</pre></div>
</div>
<p>The definition is basically same as MNIST example, except:
* Load dictionary in this configuration
* Pass it as a parameter to the DataProvider</p>
<p>The <cite>input_types</cite> is configured in method <code class="code docutils literal"><span class="pre">on_init</span></code>. It has the same
effect to configure them by <code class="code docutils literal"><span class="pre">&#64;provider</span></code>&#8216;s <code class="code docutils literal"><span class="pre">input_types</span></code> parameter.
However, the <code class="code docutils literal"><span class="pre">input_types</span></code> is set at runtime, so we can set it to
different types according to the input data. Input of the neural network is a
sequence of word id, so set <code class="code docutils literal"><span class="pre">seq_type</span></code> to <code class="code docutils literal"><span class="pre">integer_value_sequence</span></code>.</p>
<p>Durning <code class="code docutils literal"><span class="pre">on_init</span></code>, we save <code class="code docutils literal"><span class="pre">dictionary</span></code> variable to
<code class="code docutils literal"><span class="pre">settings</span></code>, and it will be used in <code class="code docutils literal"><span class="pre">process</span></code>. Note the settings
parameter for the process function and for the on_init&#8217;s function are a same
object.</p>
<p>The basic processing logic is the same as MNIST&#8217;s <code class="code docutils literal"><span class="pre">process</span></code> method. Each
sample in the data file is given back to PaddlePaddle process.</p>
<p>Thus, the basic usage of PyDataProvider is here.
Please refer to the following section reference for details.</p>
</div>
<div class="section" id="reference">
<h2>Reference<a class="headerlink" href="#reference" title="Permalink to this headline">¶</a></h2>
<div class="section" id="provider">
<h3>&#64;provider<a class="headerlink" href="#provider" title="Permalink to this headline">¶</a></h3>
<dl class="function">
<dt id="paddle.trainer.PyDataProvider2.provider">
<code class="descclassname">paddle.trainer.PyDataProvider2.</code><code class="descname">provider</code><span class="sig-paren">(</span><em>input_types=None</em>, <em>should_shuffle=None</em>, <em>pool_size=-1</em>, <em>min_pool_size=-1</em>, <em>can_over_batch_size=True</em>, <em>calc_batch_size=None</em>, <em>cache=0</em>, <em>check=False</em>, <em>check_fail_continue=False</em>, <em>init_hook=None</em>, <em>**outter_kwargs</em><span class="sig-paren">)</span><a class="headerlink" href="#paddle.trainer.PyDataProvider2.provider" title="Permalink to this definition">¶</a></dt>
<dd><p>Provider decorator. Use it to make a function into PyDataProvider2 object.
In this function, user only need to get each sample for some train/test
file.</p>
<p>The basic usage is:</p>
<div class="highlight-python"><div class="highlight"><pre><span></span><span class="nd">@provider</span><span class="p">(</span><span class="n">some</span> <span class="n">data</span> <span class="n">provider</span> <span class="n">config</span> <span class="n">here</span><span class="o">...</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">process</span><span class="p">(</span><span class="n">settings</span><span class="p">,</span> <span class="n">file_name</span><span class="p">):</span>
    <span class="k">while</span> <span class="ow">not</span> <span class="n">at</span> <span class="n">end</span> <span class="n">of</span> <span class="n">file_name</span><span class="p">:</span>
        <span class="n">sample</span> <span class="o">=</span> <span class="n">readOneSampleFromFile</span><span class="p">(</span><span class="n">file_name</span><span class="p">)</span>
        <span class="k">yield</span> <span class="n">sample</span><span class="o">.</span>
</pre></div>
</div>
<p>The configuration of data provider should be setup by:</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>input_types</strong> (<em>list|tuple|dict</em>) &#8211; Specify the input types, can also be set in init_hook.
It could be a list of InputType object. For example,
input_types=[dense_vector(9), integer_value(2)]. Or user
can set a dict of InputType object, which key is
data_layer&#8217;s name. For example, input_types=                        {&#8216;img&#8217;: img_features, &#8216;label&#8217;: label}. when using dict of
InputType, user could yield a dict of feature values, which
key is also data_layer&#8217;s name.</li>
<li><strong>should_shuffle</strong> (<em>bool</em>) &#8211; True if data should shuffle. Pass None means shuffle
when is training and not to shuffle when is testing.</li>
<li><strong>pool_size</strong> (<em>int</em>) &#8211; Max number of sample in data pool.</li>
<li><strong>min_pool_size</strong> (<em>int</em>) &#8211; Set minimal sample in data pool. The PaddlePaddle will
random pick sample in pool. So the min_pool_size
effect the randomize of data.</li>
<li><strong>can_over_batch_size</strong> (<em>bool</em>) &#8211; <p>True if paddle can return a mini-batch larger
than batch size in settings. It is useful when
custom calculate one sample&#8217;s batch_size.</p>
<p>It is very danger to set it to false and use
calc_batch_size together. Default is true.</p>
</li>
<li><strong>calc_batch_size</strong> (<em>callable</em>) &#8211; a method to calculate each sample&#8217;s batch size.
Default each sample&#8217;s batch size is 1. But to you
can customize each sample&#8217;s batch size.</li>
<li><strong>cache</strong> (<em>int</em>) &#8211; Cache strategy of Data Provider. Default is CacheType.NO_CACHE</li>
<li><strong>init_hook</strong> (<em>callable</em>) &#8211; <p>Initialize hook. Useful when data provider need load some
external data like dictionary. The parameter is
(settings, file_list, **kwargs).</p>
<ul>
<li>settings. It is the global settings object. User can set
settings.input_types here.</li>
<li>file_list. All file names for passed to data provider.</li>
<li>is_train. Is this data provider used for training or not.</li>
<li>kwargs. Other keyword arguments passed from
trainer_config&#8217;s args parameter.</li>
</ul>
</li>
<li><strong>check</strong> (<em>bool</em>) &#8211; Check the yield data format is as same as input_types. Enable
this will make data provide process slow but it is very useful
for debug. Default is disabled.</li>
<li><strong>check_fail_continue</strong> (<em>bool</em>) &#8211; Continue train or not when check failed. Just
drop the wrong format data when it is True. Has
no effect when check set to False.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>

</div>
<div class="section" id="input-types">
<h3>input_types<a class="headerlink" href="#input-types" title="Permalink to this headline">¶</a></h3>
<p>PaddlePaddle has four data types, and three sequence types.
The four data types are:</p>
<ul class="simple">
<li><code class="code docutils literal"><span class="pre">dense_vector</span></code>: dense float vector.</li>
<li><code class="code docutils literal"><span class="pre">sparse_binary_vector</span></code>: sparse binary vector, most of the value is 0, and
the non zero elements are fixed to 1.</li>
<li><code class="code docutils literal"><span class="pre">sparse_float_vector</span></code>: sparse float vector, most of the value is 0, and some
non zero elements can be any float value. They are given by the user.</li>
<li><code class="code docutils literal"><span class="pre">integer</span></code>: an integer scalar, that is especially used for label or word index.</li>
</ul>
<p>The three sequence types are:</p>
<ul class="simple">
<li><code class="code docutils literal"><span class="pre">SequenceType.NO_SEQUENCE</span></code> means the sample is not a sequence.</li>
<li><code class="code docutils literal"><span class="pre">SequenceType.SEQUENCE</span></code> means the sample is a sequence.</li>
<li><code class="code docutils literal"><span class="pre">SequenceType.SUB_SEQUENCE</span></code> means it is a nested sequence, that each timestep of
the input sequence is also a sequence.</li>
</ul>
<p>Different input type has a defferenct input format. Their formats are shown
in the above table.</p>
<table border="1" class="docutils">
<colgroup>
<col width="17%" />
<col width="17%" />
<col width="28%" />
<col width="38%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">&#160;</th>
<th class="head">NO_SEQUENCE</th>
<th class="head">SEQUENCE</th>
<th class="head">SUB_SEQUENCE</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>dense_vector</td>
<td>[f, f, ...]</td>
<td>[[f, ...], [f, ...], ...]</td>
<td>[[[f, ...], ...], [[f, ...], ...],...]</td>
</tr>
<tr class="row-odd"><td>sparse_binary_vector</td>
<td>[i, i, ...]</td>
<td>[[i, ...], [i, ...], ...]</td>
<td>[[[i, ...], ...], [[i, ...], ...],...]</td>
</tr>
<tr class="row-even"><td>sparse_float_vector</td>
<td>[(i,f), (i,f), ...]</td>
<td>[[(i,f), ...], [(i,f), ...], ...]</td>
<td>[[[(i,f), ...], ...], [[(i,f), ...], ...],...]</td>
</tr>
<tr class="row-odd"><td>integer_value</td>
<td>i</td>
<td>[i, i, ...]</td>
<td>[[i, ...], [i, ...], ...]</td>
</tr>
</tbody>
</table>
<p>where f represents a float value, i represents an integer value.</p>
</div>
<div class="section" id="init-hook">
<h3>init_hook<a class="headerlink" href="#init-hook" title="Permalink to this headline">¶</a></h3>
<p>init_hook is a function that is invoked once the data provoder is initialized.
Its parameters lists as follows:</p>
<ul class="simple">
<li>The first parameter is a settings object, which is the same to <code class="code docutils literal"><span class="pre">settings</span></code>
in <code class="code docutils literal"><span class="pre">process</span></code> method. The object contains several attributes, including:<ul>
<li><code class="code docutils literal"><span class="pre">settings.input_types</span></code>: the input types. Reference <a class="reference internal" href="#input-types">input_types</a>.</li>
<li><code class="code docutils literal"><span class="pre">settings.logger</span></code>: a logging object.</li>
</ul>
</li>
<li>The rest parameters are the key word arguments. It is made up of PaddpePaddle
pre-defined parameters and user defined parameters.<ul>
<li>PaddlePaddle-defined parameters including:<ul>
<li><code class="code docutils literal"><span class="pre">is_train</span></code> is a bool parameter that indicates the DataProvider is used in
training or testing.</li>
<li><code class="code docutils literal"><span class="pre">file_list</span></code> is the list of all files.</li>
</ul>
</li>
<li>User-defined parameters args can be set in training configuration.</li>
</ul>
</li>
</ul>
<p>Note, PaddlePaddle reserves the right to add pre-defined parameter, so please
use <code class="code docutils literal"><span class="pre">**kwargs</span></code> in init_hook to ensure compatibility by accepting the
parameters which your init_hook does not use.</p>
</div>
<div class="section" id="cache">
<h3>cache<a class="headerlink" href="#cache" title="Permalink to this headline">¶</a></h3>
<p>DataProvider provides two simple cache strategy. They are:</p>
<ul class="simple">
<li><code class="code docutils literal"><span class="pre">CacheType.NO_CACHE</span></code> means do not cache any data, then data is read at runtime by
the user implemented python module every pass.</li>
<li><code class="code docutils literal"><span class="pre">CacheType.CACHE_PASS_IN_MEM</span></code> means the first pass reads data by the user
implemented python module, and the rest passes will directly read data from
memory.</li>
</ul>
</div>
</div>
</div>


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