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Fix issue with cov scale

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This commit is contained in:
Daniel Povey 2022-06-10 16:25:45 +08:00
parent c671e213fc
commit eeb95ed502
1 changed files with 6 additions and 3 deletions
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9
egs/librispeech/ASR/pruned_transducer_stateless2/scaling.py
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@ -819,14 +819,15 @@ class DecorrelateFunction(torch.autograd.Function):
x_grad_old_sqnorm = (x_grad ** 2).sum(dim=1)
x_sqnorm = (x.detach() ** 2).sum(dim=1)
x_desired_sqscale = x_grad_old_sqnorm ** 0.5 # desired scale of x in sum for cov
x_desired_sqscale = x_grad_old_sqnorm ** 0.5 # desired scale of x*x in sum for cov
x_desired_sqscale /= (x_desired_sqscale.sum() + 1.0e-20) # sum-to-one scales
x_desired_sqscale_is_inf = (x_desired_sqscale - x_desired_sqscale != 0)
# if grads are inf, use equal scales for frames (can happen due to GradScaler, in half
# precision)
x_desired_sqscale.masked_fill_(x_desired_sqscale_is_inf, 1.0 / x_desired_sqscale.numel())
x_factor = (x_desired_sqscale / (x_sqnorm + ctx.eps)) ** 0.5
x_factor = (x_desired_sqscale * num_channels / (x_sqnorm + ctx.eps)) ** 0.5
with torch.enable_grad():
scaled_x = x * x_factor.unsqueeze(-1)
@ -837,6 +838,8 @@ class DecorrelateFunction(torch.autograd.Function):
# is not differentiable..
loss = _compute_correlation_loss(cov, ctx.eps)
#print(f"x_sqnorm mean = {x_sqnorm.mean().item()}, x_sqnorm_mean={x_sqnorm.mean().item()}, x_desired_sqscale_sum={x_desired_sqscale.sum()}, x_grad_old_sqnorm mean = {x_grad_old_sqnorm.mean().item()}, x**2_mean = {(x**2).mean().item()}, scaled_x**2_mean = {(scaled_x**2).mean().item()}, (cov-abs-mean)={cov.abs().mean().item()}, old_cov_abs_mean={old_cov.abs().mean().item()}, loss = {loss}")
if random.random() < 0.01:
logging.info(f"Decorrelate: loss = {loss}")
@ -1025,7 +1028,7 @@ def _test_pseudo_normalize():
x = torch.randn(3, 4)
x.requires_grad = True
y = PseudoNormalizeFunction.apply(x)
l = y.sin().sum()
l = (y**2).sum()
l.backward()
assert (x.grad * x).sum().abs() < 0.1