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Issue/24374: tf.einsum function to compute the trace. #1

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Issue/24374: tf.einsum function to compute the trace. #1

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13 changes: 6 additions & 7 deletions tensorflow/python/ops/special_math_ops.py
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Original file line number Diff line number Diff line change
Expand Up @@ -236,12 +236,6 @@ def einsum(equation, *inputs, **kwargs):
output_axis_labels = ''.join(
sorted(ax for ax in indices if counts[ax] == 1))

for a in axis_labels:
for input_labels in input_axis_labels:
if input_labels.count(a) > 1:
raise ValueError(
'Subscript not supported: an axis appears more than once: %s' %
input_labels)

for a in axis_labels:
input_count = sum(1 for s in input_axis_labels if a in s)
Expand All @@ -267,7 +261,12 @@ def einsum(equation, *inputs, **kwargs):
i for i, a in enumerate(temp_axis_labels)
if a not in output_axis_labels
]
temp = math_ops.reduce_sum(temp, axis=axis)
for a in axis_labels:
for input_labels in input_axis_labels:
if input_labels.count(a) == 2:
temp = math_ops.trace(temp)
else:
temp = math_ops.reduce_sum(temp, axis=axis)
temp_axis_labels = ''.join(
a for a in temp_axis_labels if a in output_axis_labels)

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