[CRASH] Fix gh-6441, fix opt crash due to wrong dtype

theano/gpuarray/opt_util.py

@@ -12,8 +12,6 @@ from theano.tensor import (DimShuffle, get_scalar_constant_value,
 from .basic_ops import GpuFromHost, HostFromGpu, GpuAllocEmpty, GpuReshape
 from .elemwise import GpuDimShuffle, GpuElemwise
 
-_one = scal.constant(np.asarray(1.0, dtype='float32'))
-
 
 def grab_cpu_scalar(v, nd):
     """
@@ -273,7 +271,9 @@ def output_merge(cls, alpha_in, beta_in, out_in):
                     return None
                 inputs = list(targ.inputs)
                 inputs[out_in] = W
-                inputs[beta_in] = _one.clone()
+                dtype = inputs[beta_in].dtype
+                one = scal.constant(np.asarray(1.0, dtype=dtype))
+                inputs[beta_in] = one
                 with inherit_stack_trace(node.outputs):
                     return maker(targ, *inputs)
         return opt