chainerx.arctan2¶

chainerx.arctan2(x1, x2)¶

Element-wise arc tangent of \(\frac{x_1}{x_2}\) choosing the quadrant correctly.

Parameters

x1 (ndarray) – Input array.
x2 (ndarray) – Input array.

Returns

Returns an array where each element represents \(\theta\) in the range \([-\pi, \pi]\), such that \(x_1 = r \sin(\theta)\) and \(x_2 = r \cos(\theta)\) for some \(r > 0\).

Return type

ndarray

Note

During backpropagation, this function propagates the gradient of the output array to the input array x1 and/or x2.