Fix neuron guided backprop pyre fixme issues (#1465)

Summary: Pull Request resolved: #1465

Differential Revision: D67705091

Author: Vivek Miglani

captum/attr/_core/neuron/neuron_guided_backprop_deconvnet.py

@@ -4,10 +4,11 @@
 from typing import Callable, List, Optional, Tuple, Union
 
 from captum._utils.gradient import construct_neuron_grad_fn
-from captum._utils.typing import TensorOrTupleOfTensorsGeneric
+from captum._utils.typing import SliceIntType, TensorOrTupleOfTensorsGeneric
 from captum.attr._core.guided_backprop_deconvnet import Deconvolution, GuidedBackprop
 from captum.attr._utils.attribution import GradientAttribution, NeuronAttribution
 from captum.log import log_usage
+from torch import Tensor
 from torch.nn import Module
 
 
@@ -60,8 +61,11 @@ def __init__(
     def attribute(
         self,
         inputs: TensorOrTupleOfTensorsGeneric,
-        # pyre-fixme[24]: Generic type `Callable` expects 2 type parameters.
-        neuron_selector: Union[int, Tuple[Union[int, slice], ...], Callable],
+        neuron_selector: Union[
+            int,
+            Tuple[Union[int, SliceIntType], ...],
+            Callable[[Union[Tensor, Tuple[Tensor, ...]]], Tensor],
+        ],
         additional_forward_args: Optional[object] = None,
         attribute_to_neuron_input: bool = False,
     ) -> TensorOrTupleOfTensorsGeneric:
@@ -215,8 +219,11 @@ def __init__(
     def attribute(
         self,
         inputs: TensorOrTupleOfTensorsGeneric,
-        # pyre-fixme[24]: Generic type `Callable` expects 2 type parameters.
-        neuron_selector: Union[int, Tuple[Union[int, slice], ...], Callable],
+        neuron_selector: Union[
+            int,
+            Tuple[Union[int, SliceIntType], ...],
+            Callable[[Union[Tensor, Tuple[Tensor, ...]]], Tensor],
+        ],
         additional_forward_args: Optional[object] = None,
         attribute_to_neuron_input: bool = False,
     ) -> TensorOrTupleOfTensorsGeneric: