Element-wise test for NaN values — returns a boolean tensor that is True at every position whose input is NaN.

Not differentiable: returns a detached boolean tensor with no autograd node, regardless of a->requires_grad().

Math

$y_i = (x_i \ne x_i)$

The IEEE-754 property "NaN does not equal itself" defines the predicate.

Shape

Output shape equals input shape (elementwise).

See Also

isinf_op, isfinite_op, nan_to_num_op.