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Increasing param_pow to 0.6 and decreasing max_lr_factor from 4 to 3.

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This commit is contained in:
Daniel Povey 2022-07-18 09:06:32 +08:00
parent 8db3b48edb
commit bb1e1e154a
1 changed files with 15 additions and 10 deletions
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21
egs/librispeech/ASR/pruned_transducer_stateless7/optim.py
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@ -109,6 +109,7 @@ class PrAdam(BatchedOptimizer):
is the scaling factor on the learning rate of p_scale.
param_pow: Power on the parameter covariance matrix, 1.0 means learn proportional
to parameter rms (1.0 will be too much, should be between 0 and 1.)
This is one of the most important tunable factors, along with max_lr_factor.
param_rms_smooth0: Limiting value of smoothing proportion for parameter matrix, as
assumed rank of param covariance [==product of sizes on the other
tensor dims] approaches 0.
@ -116,6 +117,9 @@ param_rms_smooth1: Smoothing proportion for parameter matrix, if assumed rank of
param covariance equals the dimension of the covaraince matrix.
param_rms_smooth{0,1} determine the smoothing proportions for other
conditions.
max_lr_factor: How much faster we allow any direction in parameter space to learn faster
than the mean... this is a relatively important thing to tune,
along with param_pow.
eps: An epsilon to prevent division by zero
param_min_rms: Minimum root-mean-square value of parameter tensor, for purposes of
learning the scale on the parameters (we'll keep it >= this size)
@ -138,10 +142,10 @@ param_rms_smooth1: Smoothing proportion for parameter matrix, if assumed rank of
lr=3e-02,
betas=(0.9, 0.98),
size_lr_scale=0.1,
param_pow=0.4,
param_pow=0.6,
param_rms_smooth0=0.75,
param_rms_smooth1=0.25,
param_cov_freshness=1.0,
max_lr_factor=3.0,
eps=1.0e-08,
param_min_rms=1.0e-05,
param_max_rms=2.0,
@ -161,7 +165,7 @@ param_rms_smooth1: Smoothing proportion for parameter matrix, if assumed rank of
param_pow=param_pow,
param_rms_smooth0=param_rms_smooth0,
param_rms_smooth1=param_rms_smooth1,
param_cov_freshness=param_cov_freshness,
max_lr_factor=max_lr_factor,
betas=betas,
eps=eps,
param_min_rms=param_min_rms,
@ -992,6 +996,7 @@ param_rms_smooth1: Smoothing proportion for parameter matrix, if assumed rank of
"""
smooth0 = group["param_rms_smooth0"]
smooth1 = group["param_rms_smooth1"]
max_lr_factor = group["max_lr_factor"]
param_pow = group["param_pow"]
eps = group["eps"]
batch_size = rms.shape[0]
@ -1011,13 +1016,13 @@ param_rms_smooth1: Smoothing proportion for parameter matrix, if assumed rank of
ans = rms / new_mean
if True:
# Apply max_rms
max_rms = 4.0
ans.clamp_(max=max_rms*2)
# Apply max_lr_factor; approach the constraint in 2 steps because it
# changes the mean, and it's relative to the mean.
ans.clamp_(max=max_lr_factor * 2)
ans /= _mean(ans, exclude_dims=[0], keepdim=True)
ans.clamp_(max=max_rms)
ans.clamp_(max=max_lr_factor)
ans /= _mean(ans, exclude_dims=[0], keepdim=True)
return ans