1 2 3 4 5 6 7
# The number of final concat node should be 3 input, Placeholder:0, TF_FLOAT, [1, 2, 3, 1] input, Placeholder_1:0, TF_FLOAT, [1, 2, 3, 1] input, Placeholder_2:0, TF_FLOAT, [1, 2, 3, 2] input, Placeholder_3:0, TF_FLOAT, [1, 2, 3, 2] input, Placeholder_4:0, TF_FLOAT, [1, 2, 3, 2] output, concat_3:0, TF_FLOAT, [1, 4, 6, 2]