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[scripts] Try reduced-context option for TDNN-F layers. #3658

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Merged
danpovey merged 1 commit into from
Oct 24, 2019
Merged

[scripts] Try reduced-context option for TDNN-F layers. #3658

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18 changes: 15 additions & 3 deletions egs/wsj/s5/steps/libs/nnet3/xconfig/composite_layers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -80,7 +80,8 @@ def set_default_configs(self):
'time-stride':1,
'l2-regularize':0.0,
'max-change': 0.75,
'self-repair-scale': 1.0e-05}
'self-repair-scale': 1.0e-05,
'context': 'default'}

def set_derived_configs(self):
pass
Expand All @@ -104,6 +105,10 @@ def check_configs(self):
raise RuntimeError('bypass-scale is nonzero but output-dim != input-dim: {0} != {1}'
''.format(output_dim, input_dim))

if not self.config['context'] in ['default', 'left-only', 'shift-left', 'none']:
raise RuntimeError('context must be default, left-only shift-left or none, got {}'.format(
self.config['context']))


def output_name(self, auxiliary_output=None):
assert auxiliary_output is None
Expand Down Expand Up @@ -142,9 +147,16 @@ def _generate_config(self):
bypass_scale = self.config['bypass-scale']
dropout_proportion = self.config['dropout-proportion']
time_stride = self.config['time-stride']
if time_stride != 0:
context = self.config['context']
if time_stride != 0 and context != 'none':
time_offsets1 = '{0},0'.format(-time_stride)
time_offsets2 = '0,{0}'.format(time_stride)
if context == 'default':
time_offsets2 = '0,{0}'.format(time_stride)
elif context == 'shift-left':
time_offsets2 = '{0},0'.format(-time_stride)
else:
assert context == 'left-only'
time_offsets2 = '0'
else:
time_offsets1 = '0'
time_offsets2 = '0'
Expand Down