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Fix _get_data in CombinedDataset #1778

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Fix _get_data in CombinedDataset #1778

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6 changes: 5 additions & 1 deletion returnn/datasets/meta.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1348,7 +1348,11 @@ def _get_data(self, dataset_key, dataset_seq_idx, data_key):
if dataset_data_key is not None:
return dataset.get_data(dataset_seq_idx, dataset_data_key)
else:
return numpy.array([], self.data_dtypes[data_key])
data_dim = self.data_dims[data_key]
if data_dim[1] == 1:
# sparse data
return numpy.zeros((0,), dtype=self.data_dtypes[data_key])
return numpy.zeros((0, data_dim[0]), dtype=self.data_dtypes[data_key])
Comment on lines +1351 to +1355
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Suggested change
data_dim = self.data_dims[data_key]
if data_dim[1] == 1:
# sparse data
return numpy.zeros((0,), dtype=self.data_dtypes[data_key])
return numpy.zeros((0, data_dim[0]), dtype=self.data_dtypes[data_key])
shape: List[Union[None, int]] = [0] * self.num_outputs[data_key][1]
if shape and not self.is_data_sparse(data_key):
shape[-1] = self.get_data_dim(data_key)
return numpy.zeros(shape, dtype=self.data_dtypes[data_key])


def _collect_single_seq(self, seq_idx):
"""
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