print(feature_maps)

[[2 1 4]
 [1 3 2]
 [5 2 6]
 [2 2 1]]

print(feature_maps.shape)

(4, 3)

print(dropout_mask)

[[0 1 0]]

print(dropout_mask.shape)

(1, 4)

print(feature_maps * dropout_mask)

[[2 1 4]
 [0 0 0]
 [0 0 0]
 [2 2 1]]