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@mganahl mganahl commented Dec 18, 2019

improved block retrieval for very rectangular matrices shape[1] >> shape[0]

Function avoids explicit full fusion of all legs, and instead only keeps track of the unique charges and their degeneracies upon fusion
re-intorduced BlockSparseTensor.dense_shape
new method for fusing charges and degeneracies (faster for very rectangular matrices)
fuse_charges added
@mganahl mganahl merged commit 587f4a3 into google:experimental_blocksparse Dec 18, 2019
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