Make the Gamma[Inplace]Tester don't crash with some seed.

theano/tensor/tests/test_basic.py

@@ -1397,12 +1397,8 @@ _good_broadcast_unary_gammaln = dict(
     normal=(rand_ranged(-1 + 1e-2, 10, (2, 3)),),
     empty=(numpy.asarray([]),),)
 _grad_broadcast_unary_gammaln = dict(
-    normal=(rand_ranged(1e-8, 10, (2, 3)),),)
-
-if theano.config.floatX == 'float32':
-    gamma_eps = 3e-4
-else:
-    gamma_eps = 2e-10
+    # smaler range as our grad method don't estimate it good enough.
+    normal=(rand_ranged(1e-8, 8, (2, 3)),),)
 
 GammaTester = makeBroadcastTester(
     op=tensor.gamma,
@@ -1410,7 +1406,6 @@ GammaTester = makeBroadcastTester(
     good=_good_broadcast_unary_gammaln,
     grad=_grad_broadcast_unary_gammaln,
     mode=mode_no_scipy,
-    eps=gamma_eps,
     skip=skip_scipy)
 GammaInplaceTester = makeBroadcastTester(
     op=inplace.gamma_inplace,
@@ -1418,7 +1413,6 @@ GammaInplaceTester = makeBroadcastTester(
     good=_good_broadcast_unary_gammaln,
     grad=_grad_broadcast_unary_gammaln,
     mode=mode_no_scipy,
-    eps=gamma_eps,
     inplace=True,
     skip=skip_scipy)