chore: import upstream snapshot with attribution
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<h1><a href="https://nn.labml.ai/rl/dqn/index.html">ディープQネットワーク (DQN)</a></h1>
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<p>これは、<a href="https://papers.labml.ai/paper/1312.5602">ディープ強化学習を使ったアタリプレイとデュエルネットワーク</a><a href="https://nn.labml.ai/rl/dqn/model.html">、<a href="https://nn.labml.ai/rl/dqn/replay_buffer.html">優先リプレイ</a>、<a href="https://pytorch.org">ダブルQネットワークをPyTorchで実装したものです</a></a>。</p>
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<p><a href="https://nn.labml.ai/rl/dqn/experiment.html"><a href="https://nn.labml.ai/rl/dqn/model.html">これが実験とモデルの実装です</a></a>。</p>
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<h1>マルチプロセッシング機能を備えた Atari ラッパー</h1>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">9</span><span></span><span class="kn">import</span> <span class="nn">multiprocessing</span>
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<span class="lineno">10</span><span class="kn">import</span> <span class="nn">multiprocessing.connection</span>
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<span class="lineno">11</span>
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<span class="lineno">12</span><span class="kn">import</span> <span class="nn">cv2</span>
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<span class="lineno">13</span><span class="kn">import</span> <span class="nn">gym</span>
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<span class="lineno">14</span><span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span></pre></div>
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<p><a id="GameEnvironment"></a></p>
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<h2>ゲーム環境</h2>
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<p>これはOpenAIジムゲーム環境のラッパーです。ここではいくつかのことを行います。</p>
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<p>1。4 つのフレームに同じアクションを適用し、最後のフレーム 2 を取得します。観測フレームをグレーに変換し、(84、84) 3 にスケーリングします。最後の4つのアクションを4フレーム重ねる 4.モニタリング用のエピソード情報 (エピソード全体の報酬総額) を追加 5.エピソードを1つのライフに制限します（ゲームにはライフが5つあり、ライフが1つ増えるたびにリセットされます</p>）
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<h4>観測フォーマット</h4>
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<p>観測値はサイズ (4, 84, 84) のテンソルです。最初の軸に積み重ねられた4つのフレーム（ゲーム画面の画像）です。つまり、各チャンネルはフレームです</p>。
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<div class="highlight"><pre><span class="lineno">17</span><span class="k">class</span> <span class="nc">Game</span><span class="p">:</span></pre></div>
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<div class="highlight"><pre><span class="lineno">38</span> <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">seed</span><span class="p">:</span> <span class="nb">int</span><span class="p">):</span></pre></div>
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<p>環境を作成</p>
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<div class="highlight"><pre><span class="lineno">40</span> <span class="bp">self</span><span class="o">.</span><span class="n">env</span> <span class="o">=</span> <span class="n">gym</span><span class="o">.</span><span class="n">make</span><span class="p">(</span><span class="s1">'BreakoutNoFrameskip-v4'</span><span class="p">)</span>
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<span class="lineno">41</span> <span class="bp">self</span><span class="o">.</span><span class="n">env</span><span class="o">.</span><span class="n">seed</span><span class="p">(</span><span class="n">seed</span><span class="p">)</span></pre></div>
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<p>4フレームのスタックのテンソル</p>
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<div class="highlight"><pre><span class="lineno">44</span> <span class="bp">self</span><span class="o">.</span><span class="n">obs_4</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">zeros</span><span class="p">((</span><span class="mi">4</span><span class="p">,</span> <span class="mi">84</span><span class="p">,</span> <span class="mi">84</span><span class="p">))</span></pre></div>
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<p>最後の 2 フレームまで保存するバッファ</p>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">47</span> <span class="bp">self</span><span class="o">.</span><span class="n">obs_2_max</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">zeros</span><span class="p">((</span><span class="mi">2</span><span class="p">,</span> <span class="mi">84</span><span class="p">,</span> <span class="mi">84</span><span class="p">))</span></pre></div>
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<a href='#section-6'>#</a>
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<p>エピソードの報酬を把握しておけ</p>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">50</span> <span class="bp">self</span><span class="o">.</span><span class="n">rewards</span> <span class="o">=</span> <span class="p">[]</span></pre></div>
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<p>そして残された命の数</p>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">52</span> <span class="bp">self</span><span class="o">.</span><span class="n">lives</span> <span class="o">=</span> <span class="mi">0</span></pre></div>
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<h3>ステップ</h3>
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<p><code class="highlight"><span></span><span class="n">action</span></code>
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4つのタイムステップを実行し、(観測、報酬、完了、エピソード情報) のタプルを返します。</p>
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<ul><li><code class="highlight"><span></span><span class="n">observation</span></code>
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: 4 つのフレームを積み重ねた (このフレームと最後の 3 アクションのフレーム)</li>
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<li><code class="highlight"><span></span><span class="n">reward</span></code>
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: アクション実行中の報酬の合計</li>
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<li><code class="highlight"><span></span><span class="n">done</span></code>
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: エピソードが終わったかどうか (命が失われた)</li>
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</ul><li><code class="highlight"><span></span><span class="n">episode_info</span></code>
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: エピソード情報 (完了した場合)</li>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">54</span> <span class="k">def</span> <span class="nf">step</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">action</span><span class="p">):</span></pre></div>
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||||
|
||||
</div>
|
||||
<div class='code'>
|
||||
<div class="highlight"><pre><span class="lineno">66</span> <span class="n">reward</span> <span class="o">=</span> <span class="mf">0.</span>
|
||||
<span class="lineno">67</span> <span class="n">done</span> <span class="o">=</span> <span class="kc">None</span></pre></div>
|
||||
</div>
|
||||
</div>
|
||||
<div class='section' id='section-10'>
|
||||
<div class='docs'>
|
||||
<div class='section-link'>
|
||||
<a href='#section-10'>#</a>
|
||||
</div>
|
||||
<p>4 ステップ実行</p>
|
||||
|
||||
</div>
|
||||
<div class='code'>
|
||||
<div class="highlight"><pre><span class="lineno">70</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">4</span><span class="p">):</span></pre></div>
|
||||
</div>
|
||||
</div>
|
||||
<div class='section' id='section-11'>
|
||||
<div class='docs'>
|
||||
<div class='section-link'>
|
||||
<a href='#section-11'>#</a>
|
||||
</div>
|
||||
<p>OpenAI ジム環境でアクションを実行する</p>
|
||||
|
||||
</div>
|
||||
<div class='code'>
|
||||
<div class="highlight"><pre><span class="lineno">72</span> <span class="n">obs</span><span class="p">,</span> <span class="n">r</span><span class="p">,</span> <span class="n">done</span><span class="p">,</span> <span class="n">info</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">env</span><span class="o">.</span><span class="n">step</span><span class="p">(</span><span class="n">action</span><span class="p">)</span>
|
||||
<span class="lineno">73</span>
|
||||
<span class="lineno">74</span> <span class="k">if</span> <span class="n">i</span> <span class="o">>=</span> <span class="mi">2</span><span class="p">:</span>
|
||||
<span class="lineno">75</span> <span class="bp">self</span><span class="o">.</span><span class="n">obs_2_max</span><span class="p">[</span><span class="n">i</span> <span class="o">%</span> <span class="mi">2</span><span class="p">]</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_process_obs</span><span class="p">(</span><span class="n">obs</span><span class="p">)</span>
|
||||
<span class="lineno">76</span>
|
||||
<span class="lineno">77</span> <span class="n">reward</span> <span class="o">+=</span> <span class="n">r</span></pre></div>
|
||||
</div>
|
||||
</div>
|
||||
<div class='section' id='section-12'>
|
||||
<div class='docs'>
|
||||
<div class='section-link'>
|
||||
<a href='#section-12'>#</a>
|
||||
</div>
|
||||
<p>残りライフ数を取得</p>
|
||||
|
||||
</div>
|
||||
<div class='code'>
|
||||
<div class="highlight"><pre><span class="lineno">80</span> <span class="n">lives</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">env</span><span class="o">.</span><span class="n">unwrapped</span><span class="o">.</span><span class="n">ale</span><span class="o">.</span><span class="n">lives</span><span class="p">()</span></pre></div>
|
||||
</div>
|
||||
</div>
|
||||
<div class='section' id='section-13'>
|
||||
<div class='docs'>
|
||||
<div class='section-link'>
|
||||
<a href='#section-13'>#</a>
|
||||
</div>
|
||||
<p>命が失われたらリセット</p>
|
||||
|
||||
</div>
|
||||
<div class='code'>
|
||||
<div class="highlight"><pre><span class="lineno">82</span> <span class="k">if</span> <span class="n">lives</span> <span class="o"><</span> <span class="bp">self</span><span class="o">.</span><span class="n">lives</span><span class="p">:</span>
|
||||
<span class="lineno">83</span> <span class="n">done</span> <span class="o">=</span> <span class="kc">True</span>
|
||||
<span class="lineno">84</span> <span class="k">break</span></pre></div>
|
||||
</div>
|
||||
</div>
|
||||
<div class='section' id='section-14'>
|
||||
<div class='docs'>
|
||||
<div class='section-link'>
|
||||
<a href='#section-14'>#</a>
|
||||
</div>
|
||||
<p>各ステップの報酬を維持</p>
|
||||
|
||||
</div>
|
||||
<div class='code'>
|
||||
<div class="highlight"><pre><span class="lineno">87</span> <span class="bp">self</span><span class="o">.</span><span class="n">rewards</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">reward</span><span class="p">)</span>
|
||||
<span class="lineno">88</span>
|
||||
<span class="lineno">89</span> <span class="k">if</span> <span class="n">done</span><span class="p">:</span></pre></div>
|
||||
</div>
|
||||
</div>
|
||||
<div class='section' id='section-15'>
|
||||
<div class='docs'>
|
||||
<div class='section-link'>
|
||||
<a href='#section-15'>#</a>
|
||||
</div>
|
||||
<p>終了したら、エピソードが終了したらエピソード情報を設定し、リセットします</p>
|
||||
|
||||
</div>
|
||||
<div class='code'>
|
||||
<div class="highlight"><pre><span class="lineno">91</span> <span class="n">episode_info</span> <span class="o">=</span> <span class="p">{</span><span class="s2">"reward"</span><span class="p">:</span> <span class="nb">sum</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">rewards</span><span class="p">),</span> <span class="s2">"length"</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">rewards</span><span class="p">)}</span>
|
||||
<span class="lineno">92</span> <span class="bp">self</span><span class="o">.</span><span class="n">reset</span><span class="p">()</span>
|
||||
<span class="lineno">93</span> <span class="k">else</span><span class="p">:</span>
|
||||
<span class="lineno">94</span> <span class="n">episode_info</span> <span class="o">=</span> <span class="kc">None</span></pre></div>
|
||||
</div>
|
||||
</div>
|
||||
<div class='section' id='section-16'>
|
||||
<div class='docs'>
|
||||
<div class='section-link'>
|
||||
<a href='#section-16'>#</a>
|
||||
</div>
|
||||
<p>最後の 2 フレームの最大値を取得</p>
|
||||
|
||||
</div>
|
||||
<div class='code'>
|
||||
<div class="highlight"><pre><span class="lineno">97</span> <span class="n">obs</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">obs_2_max</span><span class="o">.</span><span class="n">max</span><span class="p">(</span><span class="n">axis</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span></pre></div>
|
||||
</div>
|
||||
</div>
|
||||
<div class='section' id='section-17'>
|
||||
<div class='docs'>
|
||||
<div class='section-link'>
|
||||
<a href='#section-17'>#</a>
|
||||
</div>
|
||||
<p>4フレームのスタックにプッシュ</p>
|
||||
|
||||
</div>
|
||||
<div class='code'>
|
||||
<div class="highlight"><pre><span class="lineno">100</span> <span class="bp">self</span><span class="o">.</span><span class="n">obs_4</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">roll</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">obs_4</span><span class="p">,</span> <span class="n">shift</span><span class="o">=-</span><span class="mi">1</span><span class="p">,</span> <span class="n">axis</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span>
|
||||
<span class="lineno">101</span> <span class="bp">self</span><span class="o">.</span><span class="n">obs_4</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> <span class="o">=</span> <span class="n">obs</span>
|
||||
<span class="lineno">102</span>
|
||||
<span class="lineno">103</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">obs_4</span><span class="p">,</span> <span class="n">reward</span><span class="p">,</span> <span class="n">done</span><span class="p">,</span> <span class="n">episode_info</span></pre></div>
|
||||
</div>
|
||||
</div>
|
||||
<div class='section' id='section-18'>
|
||||
<div class='docs doc-strings'>
|
||||
<div class='section-link'>
|
||||
<a href='#section-18'>#</a>
|
||||
</div>
|
||||
<h3>環境をリセット</h3>
|
||||
<p>エピソード情報と4フレームスタックのクリーンアップ</p>
|
||||
|
||||
</div>
|
||||
<div class='code'>
|
||||
<div class="highlight"><pre><span class="lineno">105</span> <span class="k">def</span> <span class="nf">reset</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span></pre></div>
|
||||
</div>
|
||||
</div>
|
||||
<div class='section' id='section-19'>
|
||||
<div class='docs'>
|
||||
<div class='section-link'>
|
||||
<a href='#section-19'>#</a>
|
||||
</div>
|
||||
<p>OpenAI ジム環境をリセット</p>
|
||||
|
||||
</div>
|
||||
<div class='code'>
|
||||
<div class="highlight"><pre><span class="lineno">112</span> <span class="n">obs</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">env</span><span class="o">.</span><span class="n">reset</span><span class="p">()</span></pre></div>
|
||||
</div>
|
||||
</div>
|
||||
<div class='section' id='section-20'>
|
||||
<div class='docs'>
|
||||
<div class='section-link'>
|
||||
<a href='#section-20'>#</a>
|
||||
</div>
|
||||
<p>キャッシュをリセット</p>
|
||||
|
||||
</div>
|
||||
<div class='code'>
|
||||
<div class="highlight"><pre><span class="lineno">115</span> <span class="n">obs</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_process_obs</span><span class="p">(</span><span class="n">obs</span><span class="p">)</span>
|
||||
<span class="lineno">116</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">4</span><span class="p">):</span>
|
||||
<span class="lineno">117</span> <span class="bp">self</span><span class="o">.</span><span class="n">obs_4</span><span class="p">[</span><span class="n">i</span><span class="p">]</span> <span class="o">=</span> <span class="n">obs</span>
|
||||
<span class="lineno">118</span> <span class="bp">self</span><span class="o">.</span><span class="n">rewards</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
<span class="lineno">119</span>
|
||||
<span class="lineno">120</span> <span class="bp">self</span><span class="o">.</span><span class="n">lives</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">env</span><span class="o">.</span><span class="n">unwrapped</span><span class="o">.</span><span class="n">ale</span><span class="o">.</span><span class="n">lives</span><span class="p">()</span>
|
||||
<span class="lineno">121</span>
|
||||
<span class="lineno">122</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">obs_4</span></pre></div>
|
||||
</div>
|
||||
</div>
|
||||
<div class='section' id='section-21'>
|
||||
<div class='docs doc-strings'>
|
||||
<div class='section-link'>
|
||||
<a href='#section-21'>#</a>
|
||||
</div>
|
||||
<h4>ゲームフレームの処理</h4>
|
||||
<p>ゲームフレームをグレーに変換し、84x84に再スケーリング</p>
|
||||
|
||||
</div>
|
||||
<div class='code'>
|
||||
<div class="highlight"><pre><span class="lineno">124</span> <span class="nd">@staticmethod</span>
|
||||
<span class="lineno">125</span> <span class="k">def</span> <span class="nf">_process_obs</span><span class="p">(</span><span class="n">obs</span><span class="p">):</span></pre></div>
|
||||
</div>
|
||||
</div>
|
||||
<div class='section' id='section-22'>
|
||||
<div class='docs'>
|
||||
<div class='section-link'>
|
||||
<a href='#section-22'>#</a>
|
||||
</div>
|
||||
|
||||
</div>
|
||||
<div class='code'>
|
||||
<div class="highlight"><pre><span class="lineno">130</span> <span class="n">obs</span> <span class="o">=</span> <span class="n">cv2</span><span class="o">.</span><span class="n">cvtColor</span><span class="p">(</span><span class="n">obs</span><span class="p">,</span> <span class="n">cv2</span><span class="o">.</span><span class="n">COLOR_RGB2GRAY</span><span class="p">)</span>
|
||||
<span class="lineno">131</span> <span class="n">obs</span> <span class="o">=</span> <span class="n">cv2</span><span class="o">.</span><span class="n">resize</span><span class="p">(</span><span class="n">obs</span><span class="p">,</span> <span class="p">(</span><span class="mi">84</span><span class="p">,</span> <span class="mi">84</span><span class="p">),</span> <span class="n">interpolation</span><span class="o">=</span><span class="n">cv2</span><span class="o">.</span><span class="n">INTER_AREA</span><span class="p">)</span>
|
||||
<span class="lineno">132</span> <span class="k">return</span> <span class="n">obs</span></pre></div>
|
||||
</div>
|
||||
</div>
|
||||
<div class='section' id='section-23'>
|
||||
<div class='docs doc-strings'>
|
||||
<div class='section-link'>
|
||||
<a href='#section-23'>#</a>
|
||||
</div>
|
||||
<h2>ワーカープロセス</h2>
|
||||
<p>各ワーカープロセスはこのメソッドを実行します</p>
|
||||
|
||||
</div>
|
||||
<div class='code'>
|
||||
<div class="highlight"><pre><span class="lineno">135</span><span class="k">def</span> <span class="nf">worker_process</span><span class="p">(</span><span class="n">remote</span><span class="p">:</span> <span class="n">multiprocessing</span><span class="o">.</span><span class="n">connection</span><span class="o">.</span><span class="n">Connection</span><span class="p">,</span> <span class="n">seed</span><span class="p">:</span> <span class="nb">int</span><span class="p">):</span></pre></div>
|
||||
</div>
|
||||
</div>
|
||||
<div class='section' id='section-24'>
|
||||
<div class='docs'>
|
||||
<div class='section-link'>
|
||||
<a href='#section-24'>#</a>
|
||||
</div>
|
||||
<p>ゲーム作成</p>
|
||||
|
||||
</div>
|
||||
<div class='code'>
|
||||
<div class="highlight"><pre><span class="lineno">143</span> <span class="n">game</span> <span class="o">=</span> <span class="n">Game</span><span class="p">(</span><span class="n">seed</span><span class="p">)</span></pre></div>
|
||||
</div>
|
||||
</div>
|
||||
<div class='section' id='section-25'>
|
||||
<div class='docs'>
|
||||
<div class='section-link'>
|
||||
<a href='#section-25'>#</a>
|
||||
</div>
|
||||
<p>接続からの指示を待って実行する</p>
|
||||
|
||||
</div>
|
||||
<div class='code'>
|
||||
<div class="highlight"><pre><span class="lineno">146</span> <span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
|
||||
<span class="lineno">147</span> <span class="n">cmd</span><span class="p">,</span> <span class="n">data</span> <span class="o">=</span> <span class="n">remote</span><span class="o">.</span><span class="n">recv</span><span class="p">()</span>
|
||||
<span class="lineno">148</span> <span class="k">if</span> <span class="n">cmd</span> <span class="o">==</span> <span class="s2">"step"</span><span class="p">:</span>
|
||||
<span class="lineno">149</span> <span class="n">remote</span><span class="o">.</span><span class="n">send</span><span class="p">(</span><span class="n">game</span><span class="o">.</span><span class="n">step</span><span class="p">(</span><span class="n">data</span><span class="p">))</span>
|
||||
<span class="lineno">150</span> <span class="k">elif</span> <span class="n">cmd</span> <span class="o">==</span> <span class="s2">"reset"</span><span class="p">:</span>
|
||||
<span class="lineno">151</span> <span class="n">remote</span><span class="o">.</span><span class="n">send</span><span class="p">(</span><span class="n">game</span><span class="o">.</span><span class="n">reset</span><span class="p">())</span>
|
||||
<span class="lineno">152</span> <span class="k">elif</span> <span class="n">cmd</span> <span class="o">==</span> <span class="s2">"close"</span><span class="p">:</span>
|
||||
<span class="lineno">153</span> <span class="n">remote</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
|
||||
<span class="lineno">154</span> <span class="k">break</span>
|
||||
<span class="lineno">155</span> <span class="k">else</span><span class="p">:</span>
|
||||
<span class="lineno">156</span> <span class="k">raise</span> <span class="ne">NotImplementedError</span></pre></div>
|
||||
</div>
|
||||
</div>
|
||||
<div class='section' id='section-26'>
|
||||
<div class='docs doc-strings'>
|
||||
<div class='section-link'>
|
||||
<a href='#section-26'>#</a>
|
||||
</div>
|
||||
<p>新しいワーカーを作成し、別のプロセスで実行します。</p>
|
||||
|
||||
</div>
|
||||
<div class='code'>
|
||||
<div class="highlight"><pre><span class="lineno">159</span><span class="k">class</span> <span class="nc">Worker</span><span class="p">:</span></pre></div>
|
||||
</div>
|
||||
</div>
|
||||
<div class='section' id='section-27'>
|
||||
<div class='docs'>
|
||||
<div class='section-link'>
|
||||
<a href='#section-27'>#</a>
|
||||
</div>
|
||||
|
||||
</div>
|
||||
<div class='code'>
|
||||
<div class="highlight"><pre><span class="lineno">164</span> <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">seed</span><span class="p">):</span>
|
||||
<span class="lineno">165</span> <span class="bp">self</span><span class="o">.</span><span class="n">child</span><span class="p">,</span> <span class="n">parent</span> <span class="o">=</span> <span class="n">multiprocessing</span><span class="o">.</span><span class="n">Pipe</span><span class="p">()</span>
|
||||
<span class="lineno">166</span> <span class="bp">self</span><span class="o">.</span><span class="n">process</span> <span class="o">=</span> <span class="n">multiprocessing</span><span class="o">.</span><span class="n">Process</span><span class="p">(</span><span class="n">target</span><span class="o">=</span><span class="n">worker_process</span><span class="p">,</span> <span class="n">args</span><span class="o">=</span><span class="p">(</span><span class="n">parent</span><span class="p">,</span> <span class="n">seed</span><span class="p">))</span>
|
||||
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<ul><li><a href="ppo">近接ポリシー最適化</a></li>
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<h1><a href="https://nn.labml.ai/rl/ppo/index.html">近接ポリシー最適化-PPO</a></h1>
|
||||
<p><a href="https://papers.labml.ai/paper/1707.06347">これは近接ポリシー最適化</a>（PPO）<a href="https://pytorch.org">のPyTorch実装です</a>。</p>
|
||||
<p>PPOは強化学習のポリシーグラデーション法です。単純なポリシーグラデーションメソッドでは、サンプル（またはサンプルのセット）ごとに1つのグラデーション更新を行います。1つのサンプルに対して複数のグラデーションステップを実行すると、ポリシーの偏差が大きすぎて不適切なポリシーが生成されるため、問題が発生します。PPO では、ポリシーをデータのサンプリングに使用したポリシーに近い状態に保つことで、サンプルごとに複数のグラデーション更新を行うことができます。更新されたポリシーがデータのサンプリングに使用されたポリシーに合わない場合は、グラデーションフローをクリッピングして更新します</p>。
|
||||
<p><a href="https://nn.labml.ai/rl/ppo/experiment.html">これを使った実験はこちらからご覧いただけます</a>。この実験では、<a href="https://nn.labml.ai/rl/ppo/gae.html">一般化アドバンテージ推定を使用しています</a></p>。
|
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