I didn't understand the code.

[unknowed-ER]

The following 2 lines code is in surge.py. I cann't understand the function of line 197 code. It seems that the execution of this code does not change the data.

196 A_bool = tf.cast(tf.greater(A, 0), A.dtype)
197 A_bool = A_bool * (tf.ones([A.shape.as_list()[1], A.shape.as_list()[1]]) - tf.eye(A.shape.as_list()[1])) + tf.eye(A.shape.as_list()[1])