[Cherry-pick] Use scaled_dot_product_attention in Wav2vec2/HuBERT's SelfAttention (#3253) #3261
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Summary:
Replace the attention computation with
torch.nn.functional.scaled_dot_product_attention
to improve running efficiency.Pull Request resolved: #3253
Reviewed By: mthrok
Differential Revision: D44800353
Pulled By: nateanl
fbshipit-source-id: 41550d868c809099aadbe812b0ebe2c38121efb8