From 4d90f8ab7030b9026bd27d959a750298c087440d Mon Sep 17 00:00:00 2001
From: Fabio Luporini <f.luporini12@imperial.ac.uk>
Date: Wed, 6 Jul 2016 17:57:21 +0100
Subject: [PATCH] Fix circular import: utils, visitors, vectorizer

---
 coffee/visitors/utilities.py | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/coffee/visitors/utilities.py b/coffee/visitors/utilities.py
index eb75cbe9..13786438 100644
--- a/coffee/visitors/utilities.py
+++ b/coffee/visitors/utilities.py
@@ -9,7 +9,7 @@
 
 from coffee.visitor import Visitor
 from coffee.base import Sum, Sub, Prod, Div, ArrayInit, SparseArrayInit
-from coffee.utils import ItSpace, flatten
+import coffee.utils
 
 
 __all__ = ["ReplaceSymbols", "CheckUniqueness", "Uniquify", "Evaluate",
@@ -119,9 +119,11 @@ def __init__(self, decls, track_zeros):
             Prod: np.multiply,
             Div: np.divide
         }
-        from coffee.vectorizer import vect_roundup, vect_rounddown
-        self.up = vect_roundup
-        self.down = vect_rounddown
+
+        import coffee.vectorizer
+        self.up = coffee.vectorizer.vect_roundup
+        self.down = coffee.vectorizer.vect_rounddown
+        self.make_itspace = coffee.utils.ItSpace
         super(Evaluate, self).__init__()
 
     def visit_object(self, o, *args, **kwargs):
@@ -197,7 +199,7 @@ def visit_Writer(self, o, *args, **kwargs):
         for k, g in itertools.groupby(sorted(mapper[-1].keys()), grouper):
             group = list(g)
             ranges.append((group[-1]-group[0]+1, group[0]))
-        nonzero[-1] = ItSpace(mode=1).merge(ranges or nonzero[-1], within=-1)
+        nonzero[-1] = self.make_itspace(mode=1).merge(ranges or nonzero[-1], within=-1)
 
         return {lvalue: SparseArrayInit(values, precision, tuple(nonzero))}
 
@@ -301,13 +303,13 @@ def visit_Prod(self, o, parent=None, *args, **kwargs):
             projection = self.default_retval()
             for n in o.children:
                 projection.extend(self.visit(n, parent=o, *args, **kwargs))
-            return [list(flatten(projection))]
+            return [list(coffee.utils.flatten(projection))]
         else:
             # Only the top level Prod, in a chain of Prods, should do the
             # tensor product
             projection = [self.visit(n, parent=o, *args, **kwargs) for n in o.children]
             product = itertools.product(*projection)
-            ret = [list(flatten(i)) for i in product] or projection
+            ret = [list(coffee.utils.flatten(i)) for i in product] or projection
         return ret
 
     def visit_Symbol(self, o, *args, **kwargs):
@@ -434,7 +436,7 @@ def visit_Prod(self, o, ret=None, syms=None, parent=None, *args, **kwargs):
         if all(i for i in loc_syms):
             self._update_mapper(mapper, loc_syms)
             loc_syms = itertools.product(*loc_syms)
-            loc_syms = [tuple(flatten(i)) for i in loc_syms]
+            loc_syms = [tuple(coffee.utils.flatten(i)) for i in loc_syms]
             syms |= set(loc_syms)
             G.add_edges_from(loc_syms)
         else: