Sigmoid

class vulkpy.nn.Sigmoid

Bases: Module

Sigmoid

Methods Summary

__call__(x)	Call Module
backward(dy)	Backward
forward(x)	Forward
update()	Update parameters based on accumulated gradients
zero_grad()	Reset accumulated gradients to 0.

Methods Documentation

__call__(x: Array) → Array

Call Module

Parameters:

x (vulkpy.Array) – Input

Returns:

y – Output

Return type:

vulkpy.Array

Raises:

ValueError – If input (x) shape doesn’t have at least 2-dimensions.

Notes

This function stores input (x) and output (y) for training.

backward(dy: Array) → Array

Backward

Parameters:

dy (vulkpy.Array) – Batch grad

Returns:

Batch grad

Return type:

vulkpy.Array

Notes

\[dx = dy \cdot y(1 - y)\]

forward(x: Array) → Array

Forward

Parameters:

x (vulkpy.Array) – Batch input

Returns:

Batch output

Return type:

vulkpy.Array

Notes

\[y = 1/(1 + \exp (-x))\]

Warning

Generally, users should not call this method directly. Use __call__ instead, where input / output are stored for training.

update()

Update parameters based on accumulated gradients

Notes

Base class implement no-operation. Subclass can customize this method.

zero_grad()

Reset accumulated gradients to 0.

Notes

Base class implement no-operation. Subclass can customize this method.

__init__()