Yes, these two PyTorch operations are equivalent.

The first operation "torch.bmm(attention_slice, value)" uses the batch matrix multiplication (bmm) function from PyTorch. It performs matrix multiplication on two tensors where the first tensor is treated as a batch of matrices, with each matrix being multiplied by the second tensor. The resulting tensor has the shape (batch_size, attention_slice.shape[1], value.shape[2]).

The second operation "einsum('b i j, b j d -> b i d', attention_slice, value)" uses the PyTorch einsum function, which performs an Einstein summation on two tensors. The string argument "b i j, b j d -> b i d" specifies the indices of the tensors involved in the calculation and the resulting tensor's indices. It essentially performs the same calculation as torch.bmm, with the resulting tensor having the same shape (batch_size, attention_slice.shape[1], value.shape[2]).

Therefore, these two operations are equivalent and produce the same result. The choice between the two depends on personal preference and the specific use case.
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