fix(mge/functional): support non-float32 input when call isxxx

GitOrigin-RevId: ea8f394958f2789b142767b065ba541053dbab66

imperative/python/megengine/functional/math.py

@@ -3,6 +3,8 @@ import collections
 import math
 from typing import Iterable, Optional, Sequence, Tuple, Union
 
+import numpy as np
+
 from ..core._imperative_rt.core2 import Const, apply
 from ..core._imperative_rt.ops import SubgraphBuilder as _SubgraphBuilder
 from ..core.ops import builtin
@@ -11,7 +13,7 @@ from ..core.tensor.utils import _normalize_axis
 from ..tensor import Tensor
 from ..utils.deprecation import deprecated_kwargs_default
 from .elemwise import _elemwise_multi_type, clip
-from .tensor import expand_dims, squeeze
+from .tensor import broadcast_to, expand_dims, squeeze
 
 __all__ = [
     "argmax",
@@ -55,11 +57,22 @@ def isnan(inp: Tensor) -> Tensor:
         The returned array should have a data type of bool.
 
     Examples:
+        
+        >>> F.isnan(Tensor(1))
+        Tensor(False, dtype=bool, device=xpux:0)
+
+        .. TODO: Remove these comments when _elemwise_multi_type support scalar input
+        .. >>> F.isnan(Tensor(float("nan")))
+        .. Tensor(True, dtype=bool, device=xpux:0)
+
+        Element-wise isnan:
 
         >>> x = Tensor([1, float("nan"), 0])
         >>> F.isnan(x)
         Tensor([False  True False], dtype=bool, device=xpux:0)
     """
+    if not np.issubdtype(inp.dtype, np.floating):
+        return broadcast_to(Tensor(False), inp.shape)
     return _elemwise_multi_type(inp, mode="isnan", dtype="bool")
 
 
@@ -79,10 +92,21 @@ def isinf(inp: Tensor) -> Tensor:
 
     Examples:
 
+        >>> F.isinf(Tensor(1))
+        Tensor(False, dtype=bool, device=xpux:0)
+
+        .. TODO: Remove these comments when _elemwise_multi_type support scalar input
+        .. >>> F.isinf(Tensor(float("inf")))
+        .. Tensor(True, dtype=bool, device=xpux:0)
+
+        Element-wise isinf: 
+
         >>> x = Tensor([1, float("inf"), 0])
         >>> F.isinf(x)
         Tensor([False  True False], dtype=bool, device=xpux:0)
     """
+    if not np.issubdtype(inp.dtype, np.floating):
+        return broadcast_to(Tensor(False), inp.shape)
     return _elemwise_multi_type(inp, mode="isinf", dtype="bool")