fix bincount

mindspore/numpy/math_ops.py

@@ -4636,9 +4636,7 @@ def bincount(x, weights=None, minlength=0, length=None):
         if F.shape(x) != F.shape(weights):
             _raise_value_error('`x` and `weights` must have the same length')
         idx_mapping *= weights
-    if _get_device() == 'Ascend':
-        idx_mapping = F.cast(idx_mapping, mstype.float32)
-    return F.reduce_sum(idx_mapping, 1).ravel().astype(mstype.int32)
+    return F.reduce_sum(idx_mapping.astype(mstype.float32), 1).ravel()
 
 
 def histogram(a, bins=10, range=None, weights=None, density=False): # pylint: disable=redefined-builtin