Sigmoid

Implement the sigmoid activation function.

Signature: def sigmoid(x: np.ndarray) -> np.ndarray

sigmoid(0) = 0.5

Math

Asked at

Python (numpy)0/3 runs today

Test Results

○zero input

○positive values

○large values🔒 Premium

○output is non-negative (sigmoid in [0,1])

○preserves argmax (monotonic increasing)

○sigmoid(0) = 0.5 exact