Created by: luotao1

interp_op:

• 输入 X: [m, n] tensor, Y: [m, n] tensor, W: [n] tensor
• 输出　Out: [m, n] tensor

公式：Out.row[i] = W[i] * X.row[i] + (1 - W[i]) * Y.row[i]

该op可以用minus_op, add_op和elementwise_mul_op组合起来：Out= W*X+(1-W)*Y=W(X-Y)+X