Remove hack in gpuarray/ to replace Cast by Cast16

theano/sandbox/gpuarray/fp16_help.py

@@ -20,8 +20,3 @@ def write_w(dtype):
         return '__float2half_rn'
     else:
         return ''
-
-
-class Cast16(scalar.Cast):
-    def c_code(self, node, name, inputs, outputs, sub):
-        return "%s = %s;\n" % (outputs[0], inputs[0])

theano/sandbox/gpuarray/opt.py

@@ -258,20 +258,6 @@ def local_gpu_elemwise(node):
     name = op.name
     if name:
         name = 'Gpu'+name
-    if (type(scal_op) == scalar.Cast and
-            (node.inputs[0].dtype == 'float16' or
-             node.outputs[0].dtype == 'float16')):
-        scal_op = fp16_help.Cast16(scal_op.o_type, name=scal_op.name)
-    if (type(scal_op) == scalar.Composite and
-            True):
-        inputs, outputs = gof.graph.clone(scal_op.inputs, scal_op.outputs)
-        for v in variables(inputs, outputs):
-            if (type(v.op) == scalar.Cast and
-                    (v.inputs[0].dtype == 'float16' or
-                     v.outputs[0].dtype == 'float16')):
-                # We cloned the graph before so this is ok
-                v.op = fp16_help.Cast16(v.op.o_type, name=v.op.name)
-        scal_op = scalar.Composite(inputs, outputs)
     res = GpuElemwise(scal_op, name=name,
                       inplace_pattern=copy.copy(op.inplace_pattern),
                       nfunc_spec=op.nfunc_spec)