tf.listdiff(x, y, out_idx=None, name=None)
Computes the difference between two lists of numbers or strings.
Given a list x and a list y, this operation returns a list out that represents all values that are in x but not in y. The returned list out is sorted in the same order that the numbers appear in x (duplicates are preserved). This operation also returns a list idx that represents the position of each out element in x. In other words:
out[i] = x[idx[i]] for i in [0, 1, ..., len(out) - 1]
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