add. of matrices of different dim. (the bias term)

[Janardhan Pulivarthi]

Hi Matthias,

When adding the biases... For example.,


   * Inputs:
   *  - X: Inputs, of shape (N, D).
   *  - W: Weights, of shape (D, M).
   *  - b: Biases, of shape (1, M).
   *
   * Outputs:
   *  - out: Outputs, of shape (N, M).
   */

out = (X %*% W) + b; # This script works
out = b + (X %*% W); # throws dimension incompatibility error.

This can be confusing for the dml authors (it played with me, for a month).

Thanks,
Janardhan