added test for aliased function inputs (ticket #374)

theano/sparse/tests/test_basic.py

@@ -538,6 +538,27 @@ def test_may_share_memory():
                     ]:
 
         assert SparseType.may_share_memory(a_,b_)==rep
+        
+def test_sparse_shared_memory():
+    # Note : There are no inplace ops on sparse matrix yet. If  one is someday implemented, we could test it here.
+    a = random_lil((3,4), 'float32', 3).tocsr()
+    m1 = random_lil((4,4), 'float32', 3).tocsr()
+    m2 = random_lil((4,4), 'float32', 3).tocsr()
+    x = SparseType('csr', dtype='float32')()
+    y = SparseType('csr', dtype='float32')()
+   
+    sdot = theano.sparse.structured_dot
+    z = sdot(x*3,m1) + sdot(y*2, m2)
+    
+    f = theano.function([theano.In(x,mutable=True),theano.In(y,mutable = True)],z, mode='FAST_RUN')
+    
+    def f_(x,y,m1=m1,m2=m2):
+        return numpy.dot(x*3,m1) + numpy.dot(y*2,m2) 
+    
+    assert SparseType.may_share_memory(a,a) #This is trivial
+    result  = f(a,a)
+    result_ = f_(a,a)
+    assert (result_.todense() == result.todense()).all()
 
 import theano.tensor.tests.test_sharedvar
 test_shared_options=theano.tensor.tests.test_sharedvar.makeSharedTester(