feat: Added signbit function for torch frontend (ivy-llc#10713)

Co-authored-by: nathzi1505 <[email protected]>

ivy/functional/frontends/torch/pointwise_ops.py

@@ -456,3 +456,8 @@ def sigmoid(input, *, out=None):
 @to_ivy_arrays_and_back
 def lerp(input, end, weight, *, out=None):
     return ivy.add(input, ivy.multiply(weight, ivy.subtract(end, input)), out=out)
+
+
+@to_ivy_arrays_and_back
+def signbit(input, *, out=None):
+    return ivy.signbit(input, out=out)

ivy_tests/test_ivy/test_frontends/test_torch/test_pointwise_ops.py

@@ -2115,3 +2115,29 @@ def test_torch_lerp(
         end=end,
         weight=weight,
     )
+
+
+# signbit
+@handle_frontend_test(
+    fn_tree="torch.signbit",
+    dtype_and_x=helpers.dtype_and_values(
+        available_dtypes=helpers.get_dtypes("numeric"),
+    ),
+)
+def test_torch_signbit(
+    *,
+    dtype_and_x,
+    on_device,
+    fn_tree,
+    frontend,
+    test_flags,
+):
+    input_dtype, x = dtype_and_x
+    helpers.test_frontend_function(
+        input_dtypes=input_dtype,
+        frontend=frontend,
+        test_flags=test_flags,
+        fn_tree=fn_tree,
+        on_device=on_device,
+        input=x[0],
+    )