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Make the application of param_reverse_cutoff conditional, not applied when rank is a problem

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This commit is contained in:
Daniel Povey 2022-06-25 17:56:04 +08:00
parent 146d7c5a93
commit 2ccc7ccbeb
1 changed files with 13 additions and 3 deletions
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16
egs/librispeech/ASR/pruned_transducer_stateless7/optim.py
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@ -105,7 +105,7 @@ class NeutralGradient(Optimizer):
estimate_period=2000,
stats_steps=200,
param_pow=0.5,
grad_pow=0.95,
grad_pow=1.0,
grad_min_rand=0.0,
lr_for_speedup=0.03,
speedup_recalibrate_period=100,
@ -594,12 +594,15 @@ class NeutralGradient(Optimizer):
# .. this is the same as the U that diagonalizes a different P
# such that P G P^T == C^{param_pow/(2-param_pow)},
# since the P's are related by taking-to-a-power.
num_samples = p.numel() // size
reverse_cutoff = (param_reverse_cutoff if num_samples > size//4 else 1.0e+10)
P = self._estimate_proj(grad_cov,
param_cov,
param_pow / grad_pow,
param_rel_eps,
param_rel_max,
param_reverse_cutoff)
reverse_cutoff)
# The only thing we want from P is the basis that diagonalizes
@ -678,11 +681,15 @@ class NeutralGradient(Optimizer):
if size == 1:
continue
param_diag_var = param_diag_vars[dim]
num_samples = (p.numel() // size) * 4 > size
# don't apply this reverse_cutoff thing in situations where we can't get a reasonable estimate
# of param_cov even with stats accumulation, due to the shape of the tensor.
reverse_cutoff = (param_reverse_cutoff if num_samples > size//4 else 1.0e+10)
param_diag_var = self._smooth_param_diag_var(param_diag_var,
param_pow,
param_rel_eps,
param_rel_max,
param_reverse_cutoff)
reverse_cutoff)
param_scale = param_diag_var ** 0.5
proj = state[f"proj_{dim}"]
@ -912,6 +919,9 @@ class NeutralGradient(Optimizer):
# because C is symmetric, C == U S U^T, we can ignore V.
# S_sqrt is S.sqrt() in the limit where param_pow == 1.0,
# param_rel_eps=0, param_rel_max=inf
# don't apply this reverse_cutoff thing in situations where we can't get a reasonable estimate
# of param_cov even with stats accumulation, due to the shape of the tensor.
S_smoothed = self._smooth_param_diag_var(S, param_pow,
param_rel_eps, param_rel_max,
param_reverse_cutoff)