fixed build break

Author: oleksandr-pavlyk

mkl_random/mklrand.pyx

@@ -1191,7 +1191,7 @@ cdef class RandomState:
         self.set_state(state)
 
     def __reduce__(self):
-        return (mkl_random.__RandomState_ctor, (), self.get_state())
+        return (__RandomState_ctor, (), self.get_state())
 
     def leapfrog(self, int k, int nstreams):
         """
@@ -5822,6 +5822,17 @@ cdef class RandomState:
         return arr
 
 
+def __RandomState_ctor():
+    """Return a RandomState instance.
+    This function exists solely to assist (un)pickling.
+    Note that the state of the RandomState returned here is irrelevant, as this function's
+    entire purpose is to return a newly allocated RandomState whose state pickle can set.
+    Consequently the RandomState returned by this function is a freshly allocated copy
+    with a seed=0.
+    See https://github.com/numpy/numpy/issues/4763 for a detailed discussion
+    """
+    return RandomState(seed=0)
+
 _rand = RandomState()
 seed = _rand.seed
 get_state = _rand.get_state