RuntimeError: mat1 and mat2 shapes cannot be multiplied (64x512 and 25088x512)

This error occurs when trying to perform matrix multiplication between two matrices where the number of columns in the first matrix does not match the number of rows in the second matrix. In this case, mat1 has a shape of 64x512 and mat2 has a shape of 25088x512, so the multiplication cannot be performed.

To fix this error, you either need to reshape one of the matrices so that the number of columns in the first matrix matches the number of rows in the second matrix, or transpose one of the matrices so that their shapes match.

In the context of a machine learning model, this error may indicate that the input data and weight matrices are not compatible, and the model architecture or input data preprocessing may need to be revised.