revert changes in dufunc to allow tests to pass

Author: reazulhoque

numba/dppy/dufunc_inliner.py

@@ -21,7 +21,7 @@ def _run_inliner(func_ir, sig, template, arg_typs, expr, i, py_func, block,
     return True
 
 
-def _inline(func_ir, work_list, block, i, expr,py_func, typemap, calltypes,
+def _inline(func_ir, work_list, block, i, expr, py_func, typemap, calltypes,
             typingctx):
     # try and get a definition for the call, this isn't always possible as
     # it might be a eval(str)/part generated awaiting update etc. (parfors)
@@ -91,7 +91,7 @@ def dufunc_inliner(func_ir, calltypes, typemap, typingctx):
                 if isinstance(expr, ir.Expr):
                     call_node = _is_dufunc_callsite(expr, block)
                     if call_node:
-                        py_func = call_node.value.py_func
+                        py_func = call_node.value._dispatcher.py_func
                         workfn = _inline(func_ir, work_list, block, i, expr,
                                          py_func, typemap, calltypes, typingctx)
                         if workfn:

numba/np/ufunc/dufunc.py

@@ -76,9 +76,7 @@ class DUFunc(_internal._DUFunc):
     # _internal.c:dufunc_init()
     __base_kwargs = set(('identity', '_keepalive', 'nin', 'nout'))
 
-
     def __init__(self, py_func, identity=None, cache=False, targetoptions={}):
-        self.py_func = py_func
         if isinstance(py_func, Dispatcher):
             py_func = py_func.py_func
         dispatcher = jit(target='npyufunc',
@@ -101,18 +99,17 @@ def __reduce__(self):
         siglist = list(self._dispatcher.overloads.keys())
         return (serialize._rebuild_reduction,
                 (self.__class__, self._dispatcher, self.identity,
-                 self._frozen, siglist, self.py_func))
+                 self._frozen, siglist))
 
     @classmethod
-    def _rebuild(cls, dispatcher, identity, frozen, siglist, py_func):
+    def _rebuild(cls, dispatcher, identity, frozen, siglist):
         self = _internal._DUFunc.__new__(cls)
         self._initialize(dispatcher, identity)
         # Re-add signatures
         for sig in siglist:
             self.add(sig)
         if frozen:
             self.disable_compile()
-        self.py_func = py_func
         return self
 
     def build_ufunc(self):