def step()

in src/sgd.py [0:0]

• 25 lines of code
• 8 McCabe index (conditional complexity)

    def step(self):
        for group in self.param_groups:
            weight_decay = group['weight_decay']
            momentum = group['momentum']
            nesterov = group['nesterov']

            for p in group['params']:
                if p.grad is None:
                    continue

                d_p = p.grad
                if weight_decay != 0:
                    d_p = d_p.add(p, alpha=weight_decay)
                d_p.mul_(-group['lr'])

                if momentum != 0:
                    param_state = self.state[p]
                    if 'momentum_buffer' not in param_state:
                        buf = param_state['momentum_buffer'] = d_p.clone().detach()
                    else:
                        buf = param_state['momentum_buffer']
                        buf.mul_(momentum).add_(d_p)

                    if nesterov:
                        d_p = d_p.add(buf, alpha=momentum)
                    else:
                        d_p = buf

                p.add_(d_p)

        return None