SpecDB: Add spec: expm1

Reviewed By: SS-JIA

Differential Revision: D52924182

fbshipit-source-id: eb269de49928b7abbdc0ac5706957a26fa8b96c5

Author: manuelcandales

specdb/db.py

@@ -1282,6 +1282,21 @@
             OutArg(ArgType.Tensor),
         ],
     ),
+    Spec(
+        op="expm1.default",  # (Tensor self) -> Tensor
+        inspec=[
+            InPosArg(ArgType.Tensor, name="self"),
+        ],
+        outspec=[
+            OutArg(
+                ArgType.Tensor,
+                constraints=[
+                    cp.Dtype.In(lambda deps: dt.can_cast_from(torch.float)),
+                    cp.Dtype.In(lambda deps: dt.can_cast_from(deps[0].dtype)),
+                ],
+            )
+        ],
+    ),
     Spec(
         op="fill.Scalar",  # (Tensor self, Scalar value) -> Tensor
         inspec=[