give 1e-6 as the atol for float in test. That is the max precission of float32.

theano/sandbox/cuda/tests/test_nnet.py

@@ -346,7 +346,7 @@ def cmp_run_conv_nnet2_classif(seed, isize, ksize, bsize,
                                n_iter=10,
                                gpu_only=False,
                                cpu_only=False,
-                               float_atol=1e-08,
+                               float_atol=1e-06,
                                check_isfinite=True,
                                pickle=False,
                                verbose=0,