added test for moment

Author: purna135

pymc/distributions/multivariate.py

@@ -2277,9 +2277,10 @@ def dist(cls, alpha, K, *args, **kwargs):
         return super().dist([alpha, K], **kwargs)
 
     def moment(rv, size, alpha, K):
+        alpha = alpha[..., np.newaxis]
         moment = (alpha / (1 + alpha)) ** at.arange(K)
         moment *= 1 / (1 + alpha)
-        moment = at.concatenate([moment, [(alpha / (1 + alpha)) ** K]], axis=-1)
+        moment = at.concatenate([moment, (alpha / (1 + alpha)) ** K], axis=-1)
         if not rv_size_is_none(size):
             moment_size = at.concatenate(
                 [

pymc/tests/test_distributions.py

@@ -954,21 +954,14 @@ def test_hierarchical_obs_logp():
 
 
 @pytest.fixture(scope="module")
-def _compile_stickbreakingweights_logpdf():
+def stickbreakingweights_logpdf():
     _value = at.vector()
     _alpha = at.scalar()
     _k = at.iscalar()
     _logp = logp(StickBreakingWeights.dist(_alpha, _k), _value)
-    return compile_pymc([_value, _alpha, _k], _logp)
+    core_fn = compile_pymc([_value, _alpha, _k], _logp)
 
-
-def _stickbreakingweights_logpdf(value, alpha, k, _compile_stickbreakingweights_logpdf):
-    return _compile_stickbreakingweights_logpdf(value, alpha, k)
-
-
-stickbreakingweights_logpdf = np.vectorize(
-    _stickbreakingweights_logpdf, signature="(n),(),(),()->()"
-)
+    return np.vectorize(core_fn, signature="(n),(),()->()")
 
 
 class TestMatchesScipy:
@@ -2338,14 +2331,14 @@ def test_stickbreakingweights_invalid(self):
             (np.arange(1, 7, dtype="float64").reshape(2, 3), 5),
         ],
     )
-    def test_stickbreakingweights_vectorized(self, alpha, K, _compile_stickbreakingweights_logpdf):
+    def test_stickbreakingweights_vectorized(self, alpha, K, stickbreakingweights_logpdf):
         value = pm.StickBreakingWeights.dist(alpha, K).eval()
         with Model():
             sbw = StickBreakingWeights("sbw", alpha=alpha, K=K, transform=None)
         pt = {"sbw": value}
         assert_almost_equal(
             pm.logp(sbw, value).eval(),
-            stickbreakingweights_logpdf(value, alpha, K, _compile_stickbreakingweights_logpdf),
+            stickbreakingweights_logpdf(value, alpha, K),
             decimal=select_by_precision(float64=6, float32=2),
             err_msg=str(pt),
         )

pymc/tests/test_distributions_moments.py

@@ -1166,6 +1166,32 @@ def test_rice_moment(nu, sigma, size, expected):
                 fill_value=np.append((1 / 3) ** np.arange(5) * 2 / 3, (1 / 3) ** 5),
             ),
         ),
+        (
+            np.array([1, 3]),
+            11,
+            None,
+            np.array(
+                [
+                    np.append((1 / 2) ** np.arange(11) * 1 / 2, (1 / 2) ** 11),
+                    np.append((3 / 4) ** np.arange(11) * 1 / 4, (3 / 4) ** 11),
+                ]
+            ),
+        ),
+        (
+            np.array([1, 3, 5]),
+            9,
+            (5, 3),
+            np.full(
+                shape=(5, 3, 10),
+                fill_value=np.array(
+                    [
+                        np.append((1 / 2) ** np.arange(9) * 1 / 2, (1 / 2) ** 9),
+                        np.append((3 / 4) ** np.arange(9) * 1 / 4, (3 / 4) ** 9),
+                        np.append((5 / 6) ** np.arange(9) * 1 / 6, (5 / 6) ** 9),
+                    ]
+                ),
+            ),
+        ),
     ],
 )
 def test_stickbreakingweights_moment(alpha, K, size, expected):