Fix neuron conductance pyre fixme issues (#1602)

Summary: Pull Request resolved: #1602 Fixing unresolved pyre fixme issues in corresponding file Reviewed By: styusuf Differential Revision: D76737548 fbshipit-source-id: 7714f842596bb257217e1821b6c25363a4bc0bb0

Author: Vivek Miglani

captum/attr/_core/neuron/neuron_conductance.py

@@ -2,7 +2,7 @@
 
 # pyre-strict
 import warnings
-from typing import Any, Callable, Dict, List, Optional, Tuple, Union
+from typing import Any, Callable, cast, Dict, List, Optional, Tuple, Union
 
 import torch
 from captum._utils.common import (
@@ -328,9 +328,9 @@ def attribute(
  attribute_to_neuron_input=attribute_to_neuron_input,
  grad_kwargs=grad_kwargs,
  )
- # pyre-fixme[7]: Expected `TensorOrTupleOfTensorsGeneric` but got
- # `Tuple[Tensor, ...]`.
- return _format_output(is_inputs_tuple, attrs)
+ return cast(
+  TensorOrTupleOfTensorsGeneric, _format_output(is_inputs_tuple, attrs)
+ )
 
  def _attribute(
  self,