RuntimeError: mat1 and mat2 shapes cannot be multiplied (64x64 and 4096x4096)

This error occurs when attempting to perform matrix multiplication between two matrices with incompatible shapes. Specifically, the number of columns in the first matrix (mat1) must match the number of rows in the second matrix (mat2) in order for the multiplication to be valid.

In this case, mat1 has dimensions 64x64 and mat2 has dimensions 4096x4096. Since the number of columns in mat1 is not equal to the number of rows in mat2, it is not possible to perform matrix multiplication between these two matrices.

To resolve this error, either modify the dimensions of the matrices so that they are compatible for multiplication (i.e. the number of columns in mat1 matches the number of rows in mat2), or use a different operation that is compatible with the current dimensions of the matrices.