acos

→Tensor

acos(input: Tensor)

Element-wise inverse cosine in radians.

Alias of arccos. Computes $\arccos(x)$ for entries in $[-1, 1]$ .

inputTensor

Input tensor.

Tensor

Element-wise result with the same shape as input.

Mathematical definition:

\text{out}_i = \arccos(\text{input}_i), \quad \text{input}_i \in [-1, 1]

Result lies in $[0, \pi]$ . Gradient: $-1 / \sqrt{1 - x^{2}}$ .

>>> import lucid
>>> x = lucid.tensor([1.0, 2.0, 3.0])
>>> lucid.acos(x)
Tensor([...])