y_ = tf.placeholder(tf.float32, shape=[None, 2])
loss = tf.reduce_sum(tf.abs(tf.sub(x, y_)))
input_x = np.random.randn(100, 2)
input_y = np.random.randn(100, 2)
with tf.Session() as sess:
    pass
How do I feed Tensorflow placeholders with numpy arrays?