Raise an error for float16 in ReductionKernel.

Author: abergeron

pygpu/reduction.py

@@ -150,6 +150,11 @@ def __init__(self, context, dtype_out, neutral, reduce_expr, redux,
         else:
             self.arguments = arguments
 
+        if (self.dtype_out == np.dtype('float16') or
+                any(ar.dtype == numpy.dtype('float16')
+                    for ar in self.arguments)):
+            raise UnsupportedError('float16 not supported for the reduction interface')
+
         self.reduce_expr = reduce_expr
         if map_expr is None:
             if len(self.arguments) != 1: