How to do a column sum in Tensorflow?

Question

What is the equivalent of the following in Tensorflow?

np.sum(A, axis=1)

Answer 1

There is tf.reduce_sum which is a bit more powerfull tool for doing so.

# 'x' is [[1, 1, 1]
#         [1, 1, 1]]
tf.reduce_sum(x) ==> 6
tf.reduce_sum(x, 0) ==> [2, 2, 2]
tf.reduce_sum(x, 1) ==> [3, 3]
tf.reduce_sum(x, 1, keep_dims=True) ==> [[3], [3]]
tf.reduce_sum(x, [0, 1]) ==> 6