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GatingLayer, handle out_dim #839

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Merged
albertz merged 1 commit into from
Dec 7, 2021
Merged

GatingLayer, handle out_dim #839

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19 changes: 14 additions & 5 deletions returnn/tf/layers/basic.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2469,8 +2469,13 @@ class GatingLayer(_ConcatInputLayer):
"""
layer_class = "gating"

def __init__(self, activation, gate_activation="sigmoid", **kwargs):
super(GatingLayer, self).__init__(**kwargs)
def __init__(self, activation, gate_activation="sigmoid", out_dim=None, **kwargs):
"""
:param str activation:
:param str gate_activation:
:param Dim|None out_dim:
"""
super(GatingLayer, self).__init__(out_dim=out_dim, **kwargs)
from returnn.tf.util.basic import get_activation_function
act_func = get_activation_function(activation)
gate_act_func = get_activation_function(gate_activation)
Expand All @@ -2484,25 +2489,29 @@ def __init__(self, activation, gate_activation="sigmoid", **kwargs):
self.output.size_placeholder = self.input_data.size_placeholder.copy()

@classmethod
def get_out_data_from_opts(cls, name, sources, n_out=NotSpecified, **kwargs):
def get_out_data_from_opts(cls, name, sources, n_out=NotSpecified, out_dim=None, **kwargs):
"""
:param str name:
:param list[LayerBase] sources:
:param int|None|NotSpecified n_out:
:param Dim|None out_dim:
:rtype: Data
"""
input_data = get_concat_sources_data_template(sources)
assert not input_data.sparse
assert input_data.dim % 2 == 0
dim = input_data.dim // 2
new_dim_tag = FeatureDim("%s:gating" % name, dimension=dim)
if out_dim:
assert out_dim.dimension == dim
else:
out_dim = FeatureDim("%s:gating" % name, dimension=dim)
if n_out is not NotSpecified:
assert n_out == dim
return Data(
name="%s_output" % name,
dtype=input_data.dtype,
dim_tags=[
new_dim_tag if i == input_data.feature_dim_axis else d
out_dim if i == input_data.feature_dim_axis else d
for (i, d) in enumerate(input_data.dim_tags)],
sparse=False,
time_dim_axis=input_data.time_dim_axis,
Expand Down