import * as sm from '../tensor'
import { tidy } from '../util/memory'

export function sgd(
  grads: Record<string, { grad: sm.Tensor; tensor: sm.Tensor }>,
  learning_rate = 1e-3
) {
  tidy(() => {
    const lr = sm.scalar(-learning_rate)
    for (const [, v] of Object.entries(grads)) {
      const { tensor: t, grad: g } = v
      if (t.requires_grad) {
        t.update(t.detach().add(g.detach().mul(lr))).untidy()
      }
      t.grad = null
    }
  })
}