distributions.mixtures._MixtureBase: mixtures lack reparameterized sampling (#2106)

Testing Done: create a mixture distribution, check its has_rsample

Signed-off-by: Eli Sennesh <elisennesh@gmail.com>

Author: esennesh

numpyro/distributions/mixtures.py

@@ -80,6 +80,10 @@ def component_sample(
     def component_cdf(self, samples: ArrayLike) -> ArrayLike:
         raise NotImplementedError
 
+    @property
+    def has_rsample(self) -> bool:
+        return False
+
     @property
     def mixture_size(self) -> int:
         """The number of components in the mixture"""