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| <h1>Source code for mxnet.gluon.data.sampler</h1><div class="highlight"><pre> |
| <span></span><span class="c1"># Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="c1"># or more contributor license agreements. See the NOTICE file</span> |
| <span class="c1"># distributed with this work for additional information</span> |
| <span class="c1"># regarding copyright ownership. The ASF licenses this file</span> |
| <span class="c1"># to you under the Apache License, Version 2.0 (the</span> |
| <span class="c1"># "License"); you may not use this file except in compliance</span> |
| <span class="c1"># with the License. You may obtain a copy of the License at</span> |
| <span class="c1">#</span> |
| <span class="c1"># http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="c1">#</span> |
| <span class="c1"># Unless required by applicable law or agreed to in writing,</span> |
| <span class="c1"># software distributed under the License is distributed on an</span> |
| <span class="c1"># "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</span> |
| <span class="c1"># KIND, either express or implied. See the License for the</span> |
| <span class="c1"># specific language governing permissions and limitations</span> |
| <span class="c1"># under the License.</span> |
| |
| <span class="c1"># coding: utf-8</span> |
| <span class="c1"># pylint: disable=</span> |
| <span class="sd">"""Dataset sampler."""</span> |
| <span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span><span class="s1">'Sampler'</span><span class="p">,</span> <span class="s1">'SequentialSampler'</span><span class="p">,</span> <span class="s1">'RandomSampler'</span><span class="p">,</span> <span class="s1">'BatchSampler'</span><span class="p">]</span> |
| |
| <span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span> |
| |
| <div class="viewcode-block" id="Sampler"><a class="viewcode-back" href="../../../../api/python/gluon/data.html#mxnet.gluon.data.Sampler">[docs]</a><span class="k">class</span> <span class="nc">Sampler</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span> |
| <span class="sd">"""Base class for samplers.</span> |
| |
| <span class="sd"> All samplers should subclass `Sampler` and define `__iter__` and `__len__`</span> |
| <span class="sd"> methods.</span> |
| <span class="sd"> """</span> |
| <span class="k">def</span> <span class="nf">__iter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="k">raise</span> <span class="ne">NotImplementedError</span> |
| |
| <span class="k">def</span> <span class="nf">__len__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="k">raise</span> <span class="ne">NotImplementedError</span></div> |
| |
| |
| <div class="viewcode-block" id="SequentialSampler"><a class="viewcode-back" href="../../../../api/python/gluon/data.html#mxnet.gluon.data.SequentialSampler">[docs]</a><span class="k">class</span> <span class="nc">SequentialSampler</span><span class="p">(</span><span class="n">Sampler</span><span class="p">):</span> |
| <span class="sd">"""Samples elements from [0, length) sequentially.</span> |
| |
| <span class="sd"> Parameters</span> |
| <span class="sd"> ----------</span> |
| <span class="sd"> length : int</span> |
| <span class="sd"> Length of the sequence.</span> |
| <span class="sd"> """</span> |
| <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">length</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_length</span> <span class="o">=</span> <span class="n">length</span> |
| |
| <span class="k">def</span> <span class="nf">__iter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="k">return</span> <span class="nb">iter</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_length</span><span class="p">))</span> |
| |
| <span class="k">def</span> <span class="nf">__len__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_length</span></div> |
| |
| |
| <div class="viewcode-block" id="RandomSampler"><a class="viewcode-back" href="../../../../api/python/gluon/data.html#mxnet.gluon.data.RandomSampler">[docs]</a><span class="k">class</span> <span class="nc">RandomSampler</span><span class="p">(</span><span class="n">Sampler</span><span class="p">):</span> |
| <span class="sd">"""Samples elements from [0, length) randomly without replacement.</span> |
| |
| <span class="sd"> Parameters</span> |
| <span class="sd"> ----------</span> |
| <span class="sd"> length : int</span> |
| <span class="sd"> Length of the sequence.</span> |
| <span class="sd"> """</span> |
| <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">length</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_length</span> <span class="o">=</span> <span class="n">length</span> |
| |
| <span class="k">def</span> <span class="nf">__iter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="n">indices</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_length</span><span class="p">)</span> |
| <span class="n">np</span><span class="o">.</span><span class="n">random</span><span class="o">.</span><span class="n">shuffle</span><span class="p">(</span><span class="n">indices</span><span class="p">)</span> |
| <span class="k">return</span> <span class="nb">iter</span><span class="p">(</span><span class="n">indices</span><span class="p">)</span> |
| |
| <span class="k">def</span> <span class="nf">__len__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_length</span></div> |
| |
| |
| <div class="viewcode-block" id="BatchSampler"><a class="viewcode-back" href="../../../../api/python/gluon/data.html#mxnet.gluon.data.BatchSampler">[docs]</a><span class="k">class</span> <span class="nc">BatchSampler</span><span class="p">(</span><span class="n">Sampler</span><span class="p">):</span> |
| <span class="sd">"""Wraps over another `Sampler` and return mini-batches of samples.</span> |
| |
| <span class="sd"> Parameters</span> |
| <span class="sd"> ----------</span> |
| <span class="sd"> sampler : Sampler</span> |
| <span class="sd"> The source Sampler.</span> |
| <span class="sd"> batch_size : int</span> |
| <span class="sd"> Size of mini-batch.</span> |
| <span class="sd"> last_batch : {'keep', 'discard', 'rollover'}</span> |
| <span class="sd"> Specifies how the last batch is handled if batch_size does not evenly</span> |
| <span class="sd"> divide sequence length.</span> |
| |
| <span class="sd"> If 'keep', the last batch will be returned directly, but will contain</span> |
| <span class="sd"> less element than `batch_size` requires.</span> |
| |
| <span class="sd"> If 'discard', the last batch will be discarded.</span> |
| |
| <span class="sd"> If 'rollover', the remaining elements will be rolled over to the next</span> |
| <span class="sd"> iteration.</span> |
| |
| <span class="sd"> Examples</span> |
| <span class="sd"> --------</span> |
| <span class="sd"> >>> sampler = gluon.data.SequentialSampler(10)</span> |
| <span class="sd"> >>> batch_sampler = gluon.data.BatchSampler(sampler, 3, 'keep')</span> |
| <span class="sd"> >>> list(batch_sampler)</span> |
| <span class="sd"> [[0, 1, 2], [3, 4, 5], [6, 7, 8], [9]]</span> |
| <span class="sd"> """</span> |
| <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">sampler</span><span class="p">,</span> <span class="n">batch_size</span><span class="p">,</span> <span class="n">last_batch</span><span class="o">=</span><span class="s1">'keep'</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_sampler</span> <span class="o">=</span> <span class="n">sampler</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_batch_size</span> <span class="o">=</span> <span class="n">batch_size</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_last_batch</span> <span class="o">=</span> <span class="n">last_batch</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_prev</span> <span class="o">=</span> <span class="p">[]</span> |
| |
| <span class="k">def</span> <span class="nf">__iter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="n">batch</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_prev</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_prev</span><span class="p">,</span> <span class="p">[]</span> |
| <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_sampler</span><span class="p">:</span> |
| <span class="n">batch</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">i</span><span class="p">)</span> |
| <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">batch</span><span class="p">)</span> <span class="o">==</span> <span class="bp">self</span><span class="o">.</span><span class="n">_batch_size</span><span class="p">:</span> |
| <span class="k">yield</span> <span class="n">batch</span> |
| <span class="n">batch</span> <span class="o">=</span> <span class="p">[]</span> |
| <span class="k">if</span> <span class="n">batch</span><span class="p">:</span> |
| <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_last_batch</span> <span class="o">==</span> <span class="s1">'keep'</span><span class="p">:</span> |
| <span class="k">yield</span> <span class="n">batch</span> |
| <span class="k">elif</span> <span class="bp">self</span><span class="o">.</span><span class="n">_last_batch</span> <span class="o">==</span> <span class="s1">'discard'</span><span class="p">:</span> |
| <span class="k">return</span> |
| <span class="k">elif</span> <span class="bp">self</span><span class="o">.</span><span class="n">_last_batch</span> <span class="o">==</span> <span class="s1">'rollover'</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_prev</span> <span class="o">=</span> <span class="n">batch</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span> |
| <span class="s2">"last_batch must be one of 'keep', 'discard', or 'rollover', "</span> \ |
| <span class="s2">"but got </span><span class="si">%s</span><span class="s2">"</span><span class="o">%</span><span class="bp">self</span><span class="o">.</span><span class="n">_last_batch</span><span class="p">)</span> |
| |
| <span class="k">def</span> <span class="nf">__len__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_last_batch</span> <span class="o">==</span> <span class="s1">'keep'</span><span class="p">:</span> |
| <span class="k">return</span> <span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_sampler</span><span class="p">)</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="n">_batch_size</span> <span class="o">-</span> <span class="mi">1</span><span class="p">)</span> <span class="o">//</span> <span class="bp">self</span><span class="o">.</span><span class="n">_batch_size</span> |
| <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_last_batch</span> <span class="o">==</span> <span class="s1">'discard'</span><span class="p">:</span> |
| <span class="k">return</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_sampler</span><span class="p">)</span> <span class="o">//</span> <span class="bp">self</span><span class="o">.</span><span class="n">_batch_size</span> |
| <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_last_batch</span> <span class="o">==</span> <span class="s1">'rollover'</span><span class="p">:</span> |
| <span class="k">return</span> <span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_prev</span><span class="p">)</span> <span class="o">+</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_sampler</span><span class="p">))</span> <span class="o">//</span> <span class="bp">self</span><span class="o">.</span><span class="n">_batch_size</span> |
| <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span> |
| <span class="s2">"last_batch must be one of 'keep', 'discard', or 'rollover', "</span> \ |
| <span class="s2">"but got </span><span class="si">%s</span><span class="s2">"</span><span class="o">%</span><span class="bp">self</span><span class="o">.</span><span class="n">_last_batch</span><span class="p">)</span></div> |
| </pre></div> |
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