Fix flaky test_softmax_classification_batch_multi_target test case by…

… increasing precision (#1454)

Summary:
Pull Request resolved: #1454

The test case test_softmax_classification_batch_multi_target is flaky and can fail due to floating point error. This diff changes the test case to use doubles instead of single floats.

Reviewed By: Ayush-Warikoo

Differential Revision: D67071680

fbshipit-source-id: 3db2a46565670248062166bde2fb4f211c89977e

captum/attr/_core/deep_lift.py

@@ -523,8 +523,6 @@ def pre_hook(
                         additional_args, 2, ExpansionTypes.repeat
                     ),
                 )
-                # pyre-fixme[60]: Concatenation not yet support for multiple
-                #  variadic tuples: `*baseline_input_tsr, *expanded_additional_args`.
                 return (*baseline_input_tsr, *expanded_additional_args)
             return baseline_input_tsr
 

tests/attr/test_deeplift_classification.py

@@ -65,9 +65,13 @@ def test_softmax_classification_batch_zero_baseline(self) -> None:
 
     def test_softmax_classification_batch_multi_target(self) -> None:
         num_in = 40
-        inputs = torch.arange(0.0, num_in * 3.0, requires_grad=True).reshape(3, num_in)
-        baselines = torch.arange(1.0, num_in + 1).reshape(1, num_in)
-        model = SoftmaxDeepLiftModel(num_in, 20, 10)
+        inputs = (
+            torch.arange(0.0, num_in * 3.0, requires_grad=True)
+            .reshape(3, num_in)
+            .double()
+        )
+        baselines = torch.arange(1.0, num_in + 1).reshape(1, num_in).double()
+        model = SoftmaxDeepLiftModel(num_in, 20, 10).double()
         dl = DeepLift(model)
 
         self.softmax_classification(