runtimerror：mat shapes cannot be multiplied (1x14 and 13x256)

This error occurs when you try to perform matrix multiplication between matrices with incompatible shapes. In this case, you have a matrix with shape (1, 14) and another matrix with shape (13, 256), and you are trying to multiply them.

Matrix multiplication requires that the number of columns in the first matrix matches the number of rows in the second matrix. In this case, the first matrix has 14 columns and the second matrix has 13 rows, so they cannot be multiplied.

To fix this error, you need to ensure that the matrices you are trying to multiply have compatible shapes. You can either reshape the matrices to have compatible shapes or adjust your code to perform a different operation that is compatible with the current shapes of the matrices.