Method issparse

ot/backend.py:2289–2290

(self, a)

            )

    def issparse(self, a):
        return getattr(a, "is_sparse", False) or getattr(a, "is_sparse_csr", False)

    def tocsr(self, a):
        # Versions older than 1.9 do not support CSR tensors. PyTorch 1.9 and 1.10 offer a very limited support