Fix DM logp

Author: AlexAndorra

pymc3/distributions/multivariate.py

@@ -629,8 +629,6 @@ def logp(value, n, a):
         -------
         TensorVariable
         """
-        n = intX(n)
-        a = floatX(a)
         if value.ndim >= 1:
             n = at.shape_padright(n)
             if a.ndim > 1:

pymc3/tests/test_distributions.py

@@ -2259,7 +2259,6 @@ def test_batch_multinomial(self):
         sample = dist.eval()
         assert_allclose(sample, np.stack([vals, vals], axis=0))
 
-# https://github.com/pymc-devs/pymc3/pull/4508/files
     @pytest.mark.parametrize("n", [2, 3])
     def test_dirichlet_multinomial(self, n):
         self.check_logp(