Fix Theano cache/compilation interaction with c literal. We need to

theano/gof/cc.py

@@ -510,7 +510,8 @@ def struct_variable_codeblocks(variable, policies, id, symbol_table, sub):
     """
 
     name = "V%i" % id
-    symbol_table[variable] = name
+    if variable not in symbol_table:
+        symbol_table[variable] = name
     sub = dict(sub)
 #    sub['name'] = name
     sub['id'] = id
@@ -608,9 +609,20 @@ class CLinker(link.Linker):
         self.orphans = list(r for r in self.variables
                             if isinstance(r, graph.Constant) and
                             r not in self.inputs)
+        # C type constants (theano.scalar.Scalar). They don't request an object
+        self.consts = []
+        # Move c type from orphans (theano.scalar.Scalar) to self.consts
+        for variable in self.orphans:
+            if isinstance(variable, graph.Constant):
+                try:
+                    variable.type.c_literal(variable.data)
+                    self.consts.append(variable)
+                    self.orphans.remove(variable)
+                except (utils.MethodNotDefined, NotImplementedError):
+                    pass
+
         self.temps = list(set(self.variables).difference(
             self.inputs).difference(self.outputs).difference(self.orphans))
-        self.consts = []
 
     def code_gen(self):
         """
@@ -634,8 +646,6 @@ class CLinker(link.Linker):
 
         no_recycling = self.no_recycling
 
-        self.consts = []
-
         c_support_code_apply = []
         c_init_code_apply = []
 
@@ -664,7 +674,11 @@ class CLinker(link.Linker):
             #           [what to declare in each run,
             #            what to do at the beginning of each run,
             #            what to do at the end of each run]]
-            if variable in self.inputs:
+            if variable in self.consts:
+                symbol[variable] = ("(" + variable.type.c_literal(
+                    variable.data) + ")")
+                continue
+            elif variable in self.inputs:
                 # We need to extract the new inputs at each run
                 # they do not need to be relayed to Python, so we don't sync.
                 # If the variable is both an input and an output, there is
@@ -675,15 +689,6 @@ class CLinker(link.Linker):
                 if not isinstance(variable, graph.Constant):
                     raise TypeError("All orphans to CLinker must be Constant"
                                     " instances.", variable)
-                if isinstance(variable, graph.Constant):
-                    try:
-                        symbol[variable] = ("(" + variable.type.c_literal(
-                            variable.data) + ")")
-                        self.consts.append(variable)
-                        self.orphans.remove(variable)
-                        continue
-                    except (utils.MethodNotDefined, NotImplementedError):
-                        pass
                 # orphans are not inputs so we'll just get fetch them
                 # when we initialize the struct and assume they stay
                 # the same
@@ -1159,13 +1164,6 @@ class CLinker(link.Linker):
         for v in self.variables:
             if v in self.consts:
                 continue
-            if v in self.orphans and isinstance(v, graph.Constant):
-                try:
-                    # constant will be inlined, no need to get
-                    v.type.c_literal(v.data)
-                    continue
-                except (utils.MethodNotDefined, NotImplementedError):
-                    pass
             init_tasks.append((v, 'init', id))
             tasks.append((v, 'get', id + 1))
             id += 2

theano/gof/tests/test_cc.py

@@ -201,6 +201,35 @@ def test_clinker_literal_inlining():
     assert "4.12345678" in code  # we expect the number to be inlined
 
 
+def test_clinker_literal_cache():
+    # This caused bugs in the past related to the cache.
+    if not theano.config.cxx:
+        raise SkipTest("G++ not available, so we need to skip this test.")
+
+    mode = theano.Mode(linker='c')
+
+    A = theano.tensor.matrix()
+    input1 = theano.tensor.vector()
+
+    normal_svd = numpy.array([[5.936276e+01, -4.664007e-07, -2.56265e-06],
+                              [-4.664007e-07, 9.468691e-01, -3.18862e-02],
+                              [-2.562651e-06, -3.188625e-02, 1.05226e+00]],
+                             dtype=theano.config.floatX)
+
+    orientationi = numpy.array([59.36276866, 1.06116353, 0.93797339],
+                               dtype=theano.config.floatX)
+
+    for out1 in [A - input1[0]*numpy.identity(3),
+                 input1[0] * numpy.identity(3)]:
+        benchmark = theano.function(
+            inputs=[A, input1],
+            outputs=[out1],
+            on_unused_input='ignore',
+            mode=mode)
+
+        out1 = benchmark(normal_svd, orientationi)
+
+
 def test_clinker_single_node():
     if not theano.config.cxx:
         raise SkipTest("G++ not available, so we need to skip this test.")