code: def __repr__(self):
      return f"block_sparse_tensor(shape={self.shape}, values={self.__values})"
  
imports: import logging
  import torch
  from xformers import _is_triton_available
  from xformers.ops import masked_matmul
label_desc: Use image node_id 4 for calling the BlockSparseTensor obj's underlying member method code with example usage: obj.__repr__() and returns: str, self, str, self, str