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<!DOCTYPE html>
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<h1>Source code for torch.utils.model_zoo</h1><div class="highlight"><pre>
<span></span><span class="kn">import</span> <span class="nn">torch</span>
<span class="kn">import</span> <span class="nn">hashlib</span>
<span class="kn">import</span> <span class="nn">os</span>
<span class="kn">import</span> <span class="nn">re</span>
<span class="kn">import</span> <span class="nn">shutil</span>
<span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">import</span> <span class="nn">tempfile</span>
<span class="k">if</span> <span class="n">sys</span><span class="o">.</span><span class="n">version_info</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">==</span> <span class="mi">2</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">urlparse</span> <span class="k">import</span> <span class="n">urlparse</span>
<span class="kn">from</span> <span class="nn">urllib2</span> <span class="k">import</span> <span class="n">urlopen</span>
<span class="k">else</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">urllib.request</span> <span class="k">import</span> <span class="n">urlopen</span>
<span class="kn">from</span> <span class="nn">urllib.parse</span> <span class="k">import</span> <span class="n">urlparse</span>
<span class="k">try</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">tqdm</span> <span class="k">import</span> <span class="n">tqdm</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
<span class="n">tqdm</span> <span class="o">=</span> <span class="kc">None</span> <span class="c1"># defined below</span>
<span class="c1"># matches bfd8deac from resnet18-bfd8deac.pth</span>
<span class="n">HASH_REGEX</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="s1">r'-([a-f0-9]*)\.'</span><span class="p">)</span>
<div class="viewcode-block" id="load_url"><a class="viewcode-back" href="../../../model_zoo.html#torch.utils.model_zoo.load_url">[docs]</a><span class="k">def</span> <span class="nf">load_url</span><span class="p">(</span><span class="n">url</span><span class="p">,</span> <span class="n">model_dir</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">r"""Loads the Torch serialized object at the given URL.</span>
<span class="sd"> If the object is already present in `model_dir`, it's deserialied and</span>
<span class="sd"> returned. The filename part of the URL should follow the naming convention</span>
<span class="sd"> ``filename-<sha256>.ext`` where ``<sha256>`` is the first eight or more</span>
<span class="sd"> digits of the SHA256 hash of the contents of the file. The hash is used to</span>
<span class="sd"> ensure unique names and to verify the contents of the file.</span>
<span class="sd"> The default value of `model_dir` is ``$TORCH_HOME/models`` where</span>
<span class="sd"> ``$TORCH_HOME`` defaults to ``~/.torch``. The default directory can be</span>
<span class="sd"> overriden with the ``$TORCH_MODEL_ZOO`` environement variable.</span>
<span class="sd"> Args:</span>
<span class="sd"> url (string): URL of the object to download</span>
<span class="sd"> model_dir (string, optional): directory in which to save the object</span>
<span class="sd"> Example:</span>
<span class="sd"> >>> state_dict = torch.utils.model_zoo.load_url('https://s3.amazonaws.com/pytorch/models/resnet18-5c106cde.pth')</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="n">model_dir</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">torch_home</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">expanduser</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">getenv</span><span class="p">(</span><span class="s1">'TORCH_HOME'</span><span class="p">,</span> <span class="s1">'~/.torch'</span><span class="p">))</span>
<span class="n">model_dir</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">getenv</span><span class="p">(</span><span class="s1">'TORCH_MODEL_ZOO'</span><span class="p">,</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">torch_home</span><span class="p">,</span> <span class="s1">'models'</span><span class="p">))</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">exists</span><span class="p">(</span><span class="n">model_dir</span><span class="p">):</span>
<span class="n">os</span><span class="o">.</span><span class="n">makedirs</span><span class="p">(</span><span class="n">model_dir</span><span class="p">)</span>
<span class="n">parts</span> <span class="o">=</span> <span class="n">urlparse</span><span class="p">(</span><span class="n">url</span><span class="p">)</span>
<span class="n">filename</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">basename</span><span class="p">(</span><span class="n">parts</span><span class="o">.</span><span class="n">path</span><span class="p">)</span>
<span class="n">cached_file</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">model_dir</span><span class="p">,</span> <span class="n">filename</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">exists</span><span class="p">(</span><span class="n">cached_file</span><span class="p">):</span>
<span class="n">sys</span><span class="o">.</span><span class="n">stderr</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="s1">'Downloading: "</span><span class="si">{}</span><span class="s1">" to </span><span class="si">{}</span><span class="se">\n</span><span class="s1">'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">url</span><span class="p">,</span> <span class="n">cached_file</span><span class="p">))</span>
<span class="n">hash_prefix</span> <span class="o">=</span> <span class="n">HASH_REGEX</span><span class="o">.</span><span class="n">search</span><span class="p">(</span><span class="n">filename</span><span class="p">)</span><span class="o">.</span><span class="n">group</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="n">_download_url_to_file</span><span class="p">(</span><span class="n">url</span><span class="p">,</span> <span class="n">cached_file</span><span class="p">,</span> <span class="n">hash_prefix</span><span class="p">)</span>
<span class="k">return</span> <span class="n">torch</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">cached_file</span><span class="p">)</span></div>
<span class="k">def</span> <span class="nf">_download_url_to_file</span><span class="p">(</span><span class="n">url</span><span class="p">,</span> <span class="n">dst</span><span class="p">,</span> <span class="n">hash_prefix</span><span class="p">):</span>
<span class="n">u</span> <span class="o">=</span> <span class="n">urlopen</span><span class="p">(</span><span class="n">url</span><span class="p">)</span>
<span class="n">meta</span> <span class="o">=</span> <span class="n">u</span><span class="o">.</span><span class="n">info</span><span class="p">()</span>
<span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">meta</span><span class="p">,</span> <span class="s1">'getheaders'</span><span class="p">):</span>
<span class="n">file_size</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">meta</span><span class="o">.</span><span class="n">getheaders</span><span class="p">(</span><span class="s2">"Content-Length"</span><span class="p">)[</span><span class="mi">0</span><span class="p">])</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">file_size</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">meta</span><span class="o">.</span><span class="n">get_all</span><span class="p">(</span><span class="s2">"Content-Length"</span><span class="p">)[</span><span class="mi">0</span><span class="p">])</span>
<span class="n">f</span> <span class="o">=</span> <span class="n">tempfile</span><span class="o">.</span><span class="n">NamedTemporaryFile</span><span class="p">(</span><span class="n">delete</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">sha256</span> <span class="o">=</span> <span class="n">hashlib</span><span class="o">.</span><span class="n">sha256</span><span class="p">()</span>
<span class="k">with</span> <span class="n">tqdm</span><span class="p">(</span><span class="n">total</span><span class="o">=</span><span class="n">file_size</span><span class="p">)</span> <span class="k">as</span> <span class="n">pbar</span><span class="p">:</span>
<span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
<span class="n">buffer</span> <span class="o">=</span> <span class="n">u</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="mi">8192</span><span class="p">)</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">buffer</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
<span class="k">break</span>
<span class="n">f</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">buffer</span><span class="p">)</span>
<span class="n">sha256</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">buffer</span><span class="p">)</span>
<span class="n">pbar</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">buffer</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="n">digest</span> <span class="o">=</span> <span class="n">sha256</span><span class="o">.</span><span class="n">hexdigest</span><span class="p">()</span>
<span class="k">if</span> <span class="n">digest</span><span class="p">[:</span><span class="nb">len</span><span class="p">(</span><span class="n">hash_prefix</span><span class="p">)]</span> <span class="o">!=</span> <span class="n">hash_prefix</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s1">'invalid hash value (expected "</span><span class="si">{}</span><span class="s1">", got "</span><span class="si">{}</span><span class="s1">")'</span>
<span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">hash_prefix</span><span class="p">,</span> <span class="n">digest</span><span class="p">))</span>
<span class="n">shutil</span><span class="o">.</span><span class="n">move</span><span class="p">(</span><span class="n">f</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="n">dst</span><span class="p">)</span>
<span class="k">finally</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="k">if</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">exists</span><span class="p">(</span><span class="n">f</span><span class="o">.</span><span class="n">name</span><span class="p">):</span>
<span class="n">os</span><span class="o">.</span><span class="n">remove</span><span class="p">(</span><span class="n">f</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="k">if</span> <span class="n">tqdm</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="c1"># fake tqdm if it's not installed</span>
<span class="k">class</span> <span class="nc">tqdm</span><span class="p">(</span><span class="nb">object</span><span class="p">):</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">total</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">total</span> <span class="o">=</span> <span class="n">total</span>
<span class="bp">self</span><span class="o">.</span><span class="n">n</span> <span class="o">=</span> <span class="mi">0</span>
<span class="k">def</span> <span class="nf">update</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">n</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">n</span> <span class="o">+=</span> <span class="n">n</span>
<span class="n">sys</span><span class="o">.</span><span class="n">stderr</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="s2">"</span><span class="se">\r</span><span class="si">{0:.1f}</span><span class="s2">%"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="mi">100</span> <span class="o">*</span> <span class="bp">self</span><span class="o">.</span><span class="n">n</span> <span class="o">/</span> <span class="nb">float</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">total</span><span class="p">)))</span>
<span class="n">sys</span><span class="o">.</span><span class="n">stderr</span><span class="o">.</span><span class="n">flush</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">__enter__</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="k">def</span> <span class="nf">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">exc_type</span><span class="p">,</span> <span class="n">exc_val</span><span class="p">,</span> <span class="n">exc_tb</span><span class="p">):</span>
<span class="n">sys</span><span class="o">.</span><span class="n">stderr</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="s1">'</span><span class="se">\n</span><span class="s1">'</span><span class="p">)</span>
</pre></div>
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