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Fix base contraction #974

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Fix base contraction #974

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12 changes: 9 additions & 3 deletions tensornetwork/contractors/opt_einsum_paths/path_contractors.py
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Original file line number Diff line number Diff line change
Expand Up @@ -84,10 +84,16 @@ def base(nodes: Iterable[AbstractNode],

# Then apply `opt_einsum`'s algorithm
path, nodes = utils.get_path(nodes_set, algorithm)
for a, b in path:
new_node = contract_between(nodes[a], nodes[b], allow_outer_product=True)
for p in path:
if len(p) == 2:
a, b = p
new_node = contract_between(nodes[a], nodes[b], allow_outer_product=True)
elif len(p) == 1:
new_node = nodes[p[0]]
else:
raise NotImplementedError('Hypergraph contraction not supported.')
nodes.append(new_node)
nodes = utils.multi_remove(nodes, [a, b])
nodes = utils.multi_remove(nodes, p)

# if the final node has more than one edge,
# output_edge_order has to be specified
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