code: def sparse_to_dense(self):
      res = torch.zeros(self.size(), dtype=self.values.dtype)
      res[self.indices.unbind(1)] = self.values
      return res
  
imports: import torch
  from copy import deepcopy
  from torch.utils._pytree import tree_map
  from torch.testing._internal.logging_tensor import LoggingTensor
label_desc: Use image node_id 4 for calling the SparseTensor obj's underlying member method code with example usage: obj.sparse_to_dense() and returns: res