Fixed unfused attn2d scale #2387
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This PR fixes the scale parameter of the
Attention2dunfused implementation (#2385).Two aspects were corrected:
q.size(-1) ** -0.5, i.e the rsqrt of the number of queries / sequence length. This matches the default value oftorch.nn.functional.scaled_dot_product_attention.torch.nn.functional.scaled_dot_product_attention.Tests were added to check the new implementation against the fused one.