Z2charge (#516)

* add Z2Charge tests

* lintinng

* xRevert "lintinng"

This reverts commit aad9a39.

* added Z2Charge

* added bbetter tests

* linting

* change argument order in U1Charge.random, add psuedo arguments to Z2Charge.random to keep signature consistent, fixed tests

* fix typo

* fix argument order

* fix broken tests

* import Z2Charge

* import Z2Charge

Author: mganahl

tensornetwork/__init__.py

@@ -17,4 +17,4 @@
 from tensornetwork import block_sparse
 from tensornetwork.block_sparse.blocksparsetensor import BlockSparseTensor, ChargeArray
 from tensornetwork.block_sparse.index import Index
-from tensornetwork.block_sparse.charge import U1Charge, BaseCharge
+from tensornetwork.block_sparse.charge import U1Charge, BaseCharge, Z2Charge

tensornetwork/backends/symmetric/decompositions_test.py

@@ -164,7 +164,9 @@ def test_rq_decomposition(dtype, R, R1, num_charges):
 def test_qr_decomposition(dtype, R, R1):
   np.random.seed(10)
   D = 30
-  charges = [U1Charge.random(-5, 5, D) for n in range(R)]
+  charges = [
+      U1Charge.random(dimension=D, minval=-5, maxval=5) for n in range(R)
+  ]
   flows = [True] * R
   A = BlockSparseTensor.random([Index(charges[n], flows[n]) for n in range(R)],
                                dtype=dtype)

tensornetwork/block_sparse/__init__.py

@@ -7,4 +7,4 @@
 #pylint: disable=line-too-long
 from tensornetwork.block_sparse.linalg import svd, qr, diag, sqrt, trace, inv, pinv, eye, zeros, ones, randn, eigh, eig, conj, reshape, transpose, random, norm
 from tensornetwork.block_sparse.index import Index
-from tensornetwork.block_sparse.charge import U1Charge, BaseCharge
+from tensornetwork.block_sparse.charge import U1Charge, BaseCharge, Z2Charge