fix ops.where on GPU (#2111)

Author: lvyufeng

mindnlp/core/_tensor.py

@@ -265,7 +265,7 @@ def __getitem__(self, slices):
         return origin_getitem(self, slices)
 
     Tensor.__getitem__ = __getitem__
-    StubTensor.__getitem__ = __getitem__
+    StubTensor.__getitem__ = _stub_method(__getitem__)
 
     def _convert_numpy_slices(self, key):
         """递归转换 key 中的 NumPy 整数为内置 int"""

mindnlp/core/ops/pointwise.py

@@ -589,9 +589,10 @@ def mul(input, other, *, out=None):
             if isinstance(other, bool):
                 out = ops.bitwise_and(input, other)
             else:
-                out = ops.mul(input.int(), other).bool()
+                out = ops.mul(input.int(), other)
         else:
             out = ops.mul(input, other)
+        return out
 
     if isinstance(other, mindspore.Tensor):
         out_dtype = min(input.dtype, other.dtype)