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# Efficient Inference on CPU
このガイドは、CPU上で大規模なモデルの効率的な推論に焦点を当てています。
## PyTorch JITモードTorchScript
TorchScriptは、PyTorchコードからシリアライズ可能で最適化可能なモデルを作成する方法です。任意のTorchScriptプログラムは、Python依存性のないプロセスで保存およびロードできます。
デフォルトのイーガーモードと比較して、PyTorchのjitモードは通常、オペレーターフュージョンなどの最適化手法によりモデル推論のパフォーマンスが向上します。
TorchScriptの簡単な紹介については、[PyTorch TorchScriptチュートリアル](https://pytorch.org/tutorials/beginner/Intro_to_TorchScript_tutorial.html#tracing-modules)を参照してください。
### JITモードでのIPEXグラフ最適化
Intel® Extension for PyTorchは、Transformersシリーズモデルのjitモードにさらなる最適化を提供します。Intel® Extension for PyTorchをjitモードで使用することを強くお勧めします。Transformersモデルからよく使用されるオペレーターパターンのいくつかは、既にIntel® Extension for PyTorchでjitモードのフュージョンに対応しています。これらのフュージョンパターンMulti-head-attentionフュージョン、Concat Linear、Linear+Add、Linear+Gelu、Add+LayerNormフュージョンなどは有効でパフォーマンスが良いです。フュージョンの利点は、ユーザーに透過的に提供されます。分析によれば、最も人気のある質問応答、テキスト分類、トークン分類のNLPタスクの約70が、これらのフュージョンパターンを使用してFloat32精度とBFloat16混合精度の両方でパフォーマンスの利点を得ることができます。
[IPEXグラフ最適化の詳細情報](https://intel.github.io/intel-extension-for-pytorch/cpu/latest/tutorials/features/graph_optimization.html)を確認してください。
#### IPEX installation:
IPEXのリリースはPyTorchに従っています。[IPEXのインストール方法](https://intel.github.io/intel-extension-for-pytorch/)を確認してください。