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	<title>PyTorch &#8211; 编码无悔 /  Intent &amp; Focused</title>
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		<title>[原创] PyTorch做inference/prediction的时候如何使用GPU</title>
		<link>https://www.codelast.com/%e5%8e%9f%e5%88%9b-pytorch%e5%81%9ainference-prediction%e7%9a%84%e6%97%b6%e5%80%99%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8gpu/</link>
					<comments>https://www.codelast.com/%e5%8e%9f%e5%88%9b-pytorch%e5%81%9ainference-prediction%e7%9a%84%e6%97%b6%e5%80%99%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8gpu/#respond</comments>
		
		<dc:creator><![CDATA[learnhard]]></dc:creator>
		<pubDate>Mon, 27 Apr 2020 11:50:56 +0000</pubDate>
				<category><![CDATA[Algorithm]]></category>
		<category><![CDATA[原创]]></category>
		<category><![CDATA[GPU]]></category>
		<category><![CDATA[inference]]></category>
		<category><![CDATA[prediction]]></category>
		<category><![CDATA[PyTorch]]></category>
		<guid isPermaLink="false">https://www.codelast.com/?p=12047</guid>

					<description><![CDATA[<p>话不多说，直接进入主题。</p>
<p><span style="color:#0000ff;">✔</span> 判断能不能使用GPU<br />
可能有多种原因会导致不能使用GPU，比如PyTorch安装的是CPU版的，显卡驱动没有正确安装等。下面的 if 语句在正常的情况下会返回 True：</p>
<pre style="background-color:#2b2b2b;color:#a9b7c6;font-family:'JetBrains Mono';font-size:13.5pt;">
<span style="color:#cc7832;">if </span>torch.cuda.is_available():
    <span style="color:#8888c6;">print</span>(<span style="color:#6a8759;">&#39;PyTorch can use GPU on current machine!&#39;</span>)</pre>
<p><span style="color: rgb(255, 255, 255);">文章来源：</span><a href="https://www.codelast.com/" rel="noopener noreferrer" target="_blank"><span style="color: rgb(255, 255, 255);">https://www.codelast.com/</span></a><br />
<span style="color: rgb(0, 0, 255);">✔</span>&#160;设置模型使用GPU</p>
<pre style="background-color:#2b2b2b;color:#a9b7c6;font-family:'JetBrains Mono';font-size:13.5pt;">
model = MyModel(*args<span style="color:#cc7832;">, </span>**kwargs)
model.load_state_dict(torch.load(your_model_file_path))
model.eval()  <span style="color:#808080;"># </span><span style="color:#808080;font-family:'DejaVu Sans Mono';">设置成</span><span style="color:#808080;">evaluation</span><span style="color:#808080;font-family:'DejaVu Sans Mono';">模式
</span><span style="color:#cc7832;">if </span>torch.cuda.is_available():
    <span style="color:#8888c6;">print</span>(<span style="color:#6a8759;">&#39;PyTorch can use GPU on current machine!&#39;</span></pre>&#8230; <a href="https://www.codelast.com/%e5%8e%9f%e5%88%9b-pytorch%e5%81%9ainference-prediction%e7%9a%84%e6%97%b6%e5%80%99%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8gpu/" class="read-more">Read More </a>]]></description>
										<content:encoded><![CDATA[<p>话不多说，直接进入主题。</p>
<p><span style="color:#0000ff;"><img src="https://s.w.org/images/core/emoji/17.0.2/72x72/2714.png" alt="✔" class="wp-smiley" style="height: 1em; max-height: 1em;" /></span> 判断能不能使用GPU<br />
可能有多种原因会导致不能使用GPU，比如PyTorch安装的是CPU版的，显卡驱动没有正确安装等。下面的 if 语句在正常的情况下会返回 True：</p>
<pre style="background-color:#2b2b2b;color:#a9b7c6;font-family:'JetBrains Mono';font-size:13.5pt;">
<span style="color:#cc7832;">if </span>torch.cuda.is_available():
    <span style="color:#8888c6;">print</span>(<span style="color:#6a8759;">&#39;PyTorch can use GPU on current machine!&#39;</span>)</pre>
<p><span style="color: rgb(255, 255, 255);">文章来源：</span><a href="https://www.codelast.com/" rel="noopener noreferrer" target="_blank"><span style="color: rgb(255, 255, 255);">https://www.codelast.com/</span></a><br />
<span style="color: rgb(0, 0, 255);"><img src="https://s.w.org/images/core/emoji/17.0.2/72x72/2714.png" alt="✔" class="wp-smiley" style="height: 1em; max-height: 1em;" /></span>&nbsp;设置模型使用GPU</p>
<pre style="background-color:#2b2b2b;color:#a9b7c6;font-family:'JetBrains Mono';font-size:13.5pt;">
model = MyModel(*args<span style="color:#cc7832;">, </span>**kwargs)
model.load_state_dict(torch.load(your_model_file_path))
model.eval()  <span style="color:#808080;"># </span><span style="color:#808080;font-family:'DejaVu Sans Mono';">设置成</span><span style="color:#808080;">evaluation</span><span style="color:#808080;font-family:'DejaVu Sans Mono';">模式
</span><span style="color:#cc7832;">if </span>torch.cuda.is_available():
    <span style="color:#8888c6;">print</span>(<span style="color:#6a8759;">&#39;PyTorch can use GPU on current machine!&#39;</span>)
    device = torch.device(<span style="color:#6a8759;">&quot;cuda&quot;</span>)
    model.to(device)</pre>
<p>your_model_file_path 是模型文件的路径。<br />
<span id="more-12047"></span><br />
<span style="color: rgb(0, 0, 255);"><img src="https://s.w.org/images/core/emoji/17.0.2/72x72/2714.png" alt="✔" class="wp-smiley" style="height: 1em; max-height: 1em;" /></span>&nbsp;inference/predict的时候使用GPU<br />
对一次 inference 来说，假设模型的输入数据为&nbsp;model_input_tensor（torch.Tensor类型），那么计算模型输出的方法是：</p>
<pre style="background-color:#2b2b2b;color:#a9b7c6;font-family:'JetBrains Mono';font-size:13.5pt;">
<span style="color:#cc7832;">if </span>torch.cuda.is_available():  <span style="color:#808080;"># GPU available
</span><span style="color:#808080;">    </span>model_input_tensor = model_input_tensor.to(torch.device(<span style="color:#6a8759;">&#39;cuda&#39;</span>))
model_output = model(model_input_tensor)  <span style="color:#808080;"># inference</span></pre>
<p>
<span style="color: rgb(0, 0, 255);"><img src="https://s.w.org/images/core/emoji/17.0.2/72x72/2714.png" alt="✔" class="wp-smiley" style="height: 1em; max-height: 1em;" /></span>&nbsp;检查程序跑起来之后是不是真的用了GPU<br />
用 nvidia-smi 命令来查看。</p>
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		<item>
		<title>[原创] PyTorch模型的两种保存方法</title>
		<link>https://www.codelast.com/%e5%8e%9f%e5%88%9b-pytorch%e6%a8%a1%e5%9e%8b%e7%9a%84%e4%b8%a4%e7%a7%8d%e4%bf%9d%e5%ad%98%e6%96%b9%e6%b3%95/</link>
					<comments>https://www.codelast.com/%e5%8e%9f%e5%88%9b-pytorch%e6%a8%a1%e5%9e%8b%e7%9a%84%e4%b8%a4%e7%a7%8d%e4%bf%9d%e5%ad%98%e6%96%b9%e6%b3%95/#respond</comments>
		
		<dc:creator><![CDATA[learnhard]]></dc:creator>
		<pubDate>Mon, 18 Nov 2019 17:19:03 +0000</pubDate>
				<category><![CDATA[Algorithm]]></category>
		<category><![CDATA[原创]]></category>
		<category><![CDATA[PyTorch]]></category>
		<category><![CDATA[保存]]></category>
		<category><![CDATA[模型]]></category>
		<guid isPermaLink="false">https://www.codelast.com/?p=10953</guid>

					<description><![CDATA[<p>
根据<a href="https://pytorch.org/docs/master/notes/serialization.html" rel="noopener noreferrer" target="_blank"><span style="background-color:#ffa07a;">PyTorch文档</span></a>，在把PyTorch模型保存成文件的时候有两种方法，第一种是推荐的：</p>
<pre style="background-color:#2b2b2b;color:#a9b7c6;font-family:'Droid Sans Mono';font-size:13.5pt;">
torch.save(the_model.state_dict()<span style="color:#cc7832;">, </span>PATH)</pre>
<p>对应地，加载模型这样做：</p>
<pre style="background-color:#2b2b2b;color:#a9b7c6;font-family:'Droid Sans Mono';font-size:13.5pt;">
the_model = TheModelClass(*args<span style="color:#cc7832;">, </span>**kwargs)
the_model.load_state_dict(torch.load(PATH))</pre>
<p><span id="more-10953"></span><br />
另一种方法是<span style="color:#ff0000;">不推荐</span>的：</p>
<pre style="background-color:#2b2b2b;color:#a9b7c6;font-family:'Droid Sans Mono';font-size:13.5pt;">
torch.save(the_model<span style="color:#cc7832;">, </span>PATH)</pre>
<p>对应地，加载模型这样做：</p>
<pre style="background-color:#2b2b2b;color:#a9b7c6;font-family:'Droid Sans Mono';font-size:13.5pt;">
the_model = torch.load(PATH)</pre>
<p><span style="color: rgb(255, 255, 255);">文章来源：</span><a href="https://www.codelast.com/" rel="noopener noreferrer" target="_blank"><span style="color: rgb(255, 255, 255);">https://www.codelast.com/</span></a><br />
这两者的区别：第1种方法只保存了模型的参数，而第2种方法保存了整个模型(结构+参数)，所以<span style="color:#0000ff;">第2种方法保存出来的文件体积会比第1种方法大</span>。<br />
使用第2种方法的话，序列化的数据将绑定到所使用的特定类和确切的目录结构，因此在其他项目中使用或经过一些大的重构后，它可能会失效。<br />
<span style="color: rgb(255, 255, 255);">文章来源：</span><a href="https://www.codelast.com/" rel="noopener noreferrer" target="_blank"><span style="color: rgb(255, 255, 255);">https://www.codelast.com/</span></a><br />
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										<content:encoded><![CDATA[<p>
根据<a href="https://pytorch.org/docs/master/notes/serialization.html" rel="noopener noreferrer" target="_blank"><span style="background-color:#ffa07a;">PyTorch文档</span></a>，在把PyTorch模型保存成文件的时候有两种方法，第一种是推荐的：</p>
<pre style="background-color:#2b2b2b;color:#a9b7c6;font-family:'Droid Sans Mono';font-size:13.5pt;">
torch.save(the_model.state_dict()<span style="color:#cc7832;">, </span>PATH)</pre>
<p>对应地，加载模型这样做：</p>
<pre style="background-color:#2b2b2b;color:#a9b7c6;font-family:'Droid Sans Mono';font-size:13.5pt;">
the_model = TheModelClass(*args<span style="color:#cc7832;">, </span>**kwargs)
the_model.load_state_dict(torch.load(PATH))</pre>
<p><span id="more-10953"></span><br />
另一种方法是<span style="color:#ff0000;">不推荐</span>的：</p>
<pre style="background-color:#2b2b2b;color:#a9b7c6;font-family:'Droid Sans Mono';font-size:13.5pt;">
torch.save(the_model<span style="color:#cc7832;">, </span>PATH)</pre>
<p>对应地，加载模型这样做：</p>
<pre style="background-color:#2b2b2b;color:#a9b7c6;font-family:'Droid Sans Mono';font-size:13.5pt;">
the_model = torch.load(PATH)</pre>
<p><span style="color: rgb(255, 255, 255);">文章来源：</span><a href="https://www.codelast.com/" rel="noopener noreferrer" target="_blank"><span style="color: rgb(255, 255, 255);">https://www.codelast.com/</span></a><br />
这两者的区别：第1种方法只保存了模型的参数，而第2种方法保存了整个模型(结构+参数)，所以<span style="color:#0000ff;">第2种方法保存出来的文件体积会比第1种方法大</span>。<br />
使用第2种方法的话，序列化的数据将绑定到所使用的特定类和确切的目录结构，因此在其他项目中使用或经过一些大的重构后，它可能会失效。<br />
<span style="color: rgb(255, 255, 255);">文章来源：</span><a href="https://www.codelast.com/" rel="noopener noreferrer" target="_blank"><span style="color: rgb(255, 255, 255);">https://www.codelast.com/</span></a><br />
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		<title>[原创] PyTorch模型 .pt，.pth，.pkl 的区别</title>
		<link>https://www.codelast.com/%e5%8e%9f%e5%88%9b-pytorch%e6%a8%a1%e5%9e%8b-pt%ef%bc%8c-pth%ef%bc%8c-pkl-%e7%9a%84%e5%8c%ba%e5%88%ab/</link>
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		<dc:creator><![CDATA[learnhard]]></dc:creator>
		<pubDate>Mon, 18 Nov 2019 17:00:46 +0000</pubDate>
				<category><![CDATA[原创]]></category>
		<category><![CDATA[综合]]></category>
		<category><![CDATA[pickle]]></category>
		<category><![CDATA[pkl]]></category>
		<category><![CDATA[pt]]></category>
		<category><![CDATA[pth]]></category>
		<category><![CDATA[PyTorch]]></category>
		<guid isPermaLink="false">https://www.codelast.com/?p=10950</guid>

					<description><![CDATA[<p>
我们经常会看到后缀名为 .pt，.pth，.pkl 的PyTorch模型文件，这几种模型文件在格式上有什么区别吗？<br />
其实它们并不是在格式上有区别，而只是后缀上不同而已（仅此而已）。在用 torch.save() 函数保存模型文件的时候，各人有不同的喜好，有些人喜欢用 .pt 后缀，有些人喜欢用 .pth&#160;或&#160;.pkl。用相同的 torch.save()&#160;语句保存出来的模型文件没有什么不同。<br />
在PyTorch官方的文档/代码里，<a href="https://pytorch.org/docs/master/torch.html#torch.load" rel="noopener noreferrer" target="_blank"><span style="background-color:#ffa07a;">有用 .pt 的</span></a>，<a href="https://pytorch.org/docs/master/hub.html" rel="noopener noreferrer" target="_blank"><span style="background-color:#ffa07a;">也有用 .pth 的</span></a>。<br />
据某些文章的说法，一般惯例是使用 .pth，但是官方文档里貌似 .pt&#160;更多，而且官方也不是很在意固定用一种，大家就自便吧。<br />
<span id="more-10950"></span><br />
另外，为什么会有 .pkl&#160;这种后缀名？因为 Python&#160;有一个序列化/反序列化的模块，名字叫 <span style="color:#ff0000;">pickle</span>，用它保存的文件，通常会起一个 .pkl&#160;的后缀名。torch.save()&#160;正是使用了Python pickle来保存模型的，因此使用 .pkl&#160;作为模型文件的后缀也就不奇怪了。<br />
<span style="color: rgb(255, 255, 255);">文章来源：</span><a href="https://www.codelast.com/" rel="noopener noreferrer" target="_blank"><span style="color: rgb(255, 255, 255);">https://www.codelast.com/</span></a><br />
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										<content:encoded><![CDATA[<p>
我们经常会看到后缀名为 .pt，.pth，.pkl 的PyTorch模型文件，这几种模型文件在格式上有什么区别吗？<br />
其实它们并不是在格式上有区别，而只是后缀上不同而已（仅此而已）。在用 torch.save() 函数保存模型文件的时候，各人有不同的喜好，有些人喜欢用 .pt 后缀，有些人喜欢用 .pth&nbsp;或&nbsp;.pkl。用相同的 torch.save()&nbsp;语句保存出来的模型文件没有什么不同。<br />
在PyTorch官方的文档/代码里，<a href="https://pytorch.org/docs/master/torch.html#torch.load" rel="noopener noreferrer" target="_blank"><span style="background-color:#ffa07a;">有用 .pt 的</span></a>，<a href="https://pytorch.org/docs/master/hub.html" rel="noopener noreferrer" target="_blank"><span style="background-color:#ffa07a;">也有用 .pth 的</span></a>。<br />
据某些文章的说法，一般惯例是使用 .pth，但是官方文档里貌似 .pt&nbsp;更多，而且官方也不是很在意固定用一种，大家就自便吧。<br />
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另外，为什么会有 .pkl&nbsp;这种后缀名？因为 Python&nbsp;有一个序列化/反序列化的模块，名字叫 <span style="color:#ff0000;">pickle</span>，用它保存的文件，通常会起一个 .pkl&nbsp;的后缀名。torch.save()&nbsp;正是使用了Python pickle来保存模型的，因此使用 .pkl&nbsp;作为模型文件的后缀也就不奇怪了。<br />
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