Closes #3051 - logp numpy array input fixed

RELEASE-NOTES.md

@@ -16,19 +16,23 @@
 - `pm.LKJCholeskyCov` now automatically computes and returns the unpacked Cholesky decomposition, the correlations and the standard deviations of the covariance matrix (see [#3881](https://github.com/pymc-devs/pymc3/pull/3881)).
 
 ### Maintenance
-- Remove `sample_ppc` and `sample_ppc_w` that were deprecated in 3.6.
 - Tuning results no longer leak into sequentially sampled `Metropolis` chains (see #3733 and #3796).
-- Deprecated `sd` in version 3.7 has been replaced by `sigma` now raises `DeprecationWarning` on using `sd` in continuous, mixed and timeseries distributions. (see #3837 and #3688).
-- We'll deprecate the `Text` and `SQLite` backends and the `save_trace`/`load_trace` functions, since this is now done with ArviZ. (see [#3902](https://github.com/pymc-devs/pymc3/pull/3902))
 - In named models, `pm.Data` objects now get model-relative names (see [#3843](https://github.com/pymc-devs/pymc3/pull/3843)).
 - `pm.sample` now takes 1000 draws and 1000 tuning samples by default, instead of 500 previously (see [#3855](https://github.com/pymc-devs/pymc3/pull/3855)).
-- Dropped some deprecated kwargs and functions (see [#3906](https://github.com/pymc-devs/pymc3/pull/3906))
-- Dropped the outdated 'nuts' initialization method for `pm.sample` (see [#3863](https://github.com/pymc-devs/pymc3/pull/3863)).
 - Moved argument division out of `NegativeBinomial` `random` method. Fixes [#3864](https://github.com/pymc-devs/pymc3/issues/3864) in the style of [#3509](https://github.com/pymc-devs/pymc3/pull/3509).
 - The Dirichlet distribution now raises a ValueError when it's initialized with <= 0 values (see [#3853](https://github.com/pymc-devs/pymc3/pull/3853)).
+- Dtype bugfix in `MvNormal` and `MvStudentT` (see [3836](https://github.com/pymc-devs/pymc3/pull/3836))
 - End of sampling report now uses `arviz.InferenceData` internally and avoids storing
   pointwise log likelihood (see [#3883](https://github.com/pymc-devs/pymc3/pull/3883))
 
+### Deprecations
+- Remove `sample_ppc` and `sample_ppc_w` that were deprecated in 3.6.
+- Deprecated `sd` in version 3.7 has been replaced by `sigma` now raises `DeprecationWarning` on using `sd` in continuous, mixed and timeseries distributions. (see [#3837](https://github.com/pymc-devs/pymc3/pull/3837) and [#3688](https://github.com/pymc-devs/pymc3/issues/3688)).
+- We'll deprecate the `Text` and `SQLite` backends and the `save_trace`/`load_trace` functions, since this is now done with ArviZ. (see [#3902](https://github.com/pymc-devs/pymc3/pull/3902))
+- Dropped some deprecated kwargs and functions (see [#3906](https://github.com/pymc-devs/pymc3/pull/3906))
+- Dropped the outdated 'nuts' initialization method for `pm.sample` (see [#3863](https://github.com/pymc-devs/pymc3/pull/3863)).
+
+
 ## PyMC3 3.8 (November 29 2019)
 
 ### New features

pymc3/distributions/multivariate.py

@@ -27,7 +27,7 @@
 from theano.tensor.slinalg import Cholesky
 import pymc3 as pm
 
-from pymc3.theanof import floatX, intX
+from pymc3.theanof import floatX
 from . import transforms
 from pymc3.util import get_variable_name
 from .distribution import (Continuous, Discrete, draw_values, generate_samples,
@@ -325,7 +325,7 @@ def logp(self, value):
         TensorVariable
         """
         quaddist, logdet, ok = self._quaddist(value)
-        k = intX(value.shape[-1]).astype(theano.config.floatX)
+        k = floatX(value.shape[-1])
         norm = - 0.5 * k * pm.floatX(np.log(2 * np.pi))
         return bound(norm - 0.5 * quaddist - logdet, ok)
 
@@ -439,7 +439,7 @@ def logp(self, value):
         TensorVariable
         """
         quaddist, logdet, ok = self._quaddist(value)
-        k = intX(value.shape[-1]).astype(theano.config.floatX)
+        k = floatX(value.shape[-1])
 
         norm = (gammaln((self.nu + k) / 2.)
                 - gammaln(self.nu / 2.)

pymc3/tests/test_distributions.py

@@ -1414,3 +1414,21 @@ def test_orderedlogistic_dimensions(shape):
     assert np.allclose(clogp, expected)
     assert ol.distribution.p.ndim == (len(shape) + 1)
     assert np.allclose(ologp, expected)
+
+
+class TestBugfixes:
+    @pytest.mark.parametrize('dist_cls,kwargs', [
+        (MvNormal, dict(mu=0)),
+        (MvStudentT, dict(mu=0, nu=2))
+    ])
+    @pytest.mark.parametrize('dims', [1,2,4])
+    def test_issue_3051(self, dims, dist_cls, kwargs):
+        d = dist_cls.dist(**kwargs, cov=np.eye(dims), shape=(dims,))
+
+        X = np.random.normal(size=(20,dims))
+        actual_t = d.logp(X)
+        assert isinstance(actual_t, tt.TensorVariable)
+        actual_a = actual_t.eval()
+        assert isinstance(actual_a, np.ndarray)
+        assert actual_a.shape == (X.shape[0],)
+        pass