Add mvnormal logp dlogp benchmark test

Author: ricardoV94

tests/tensor/test_blockwise.py

@@ -9,10 +9,10 @@
 from pytensor.gradient import grad
 from pytensor.graph import Apply, Op
 from pytensor.graph.replace import vectorize_node
-from pytensor.tensor import tensor
+from pytensor.tensor import diagonal, log, tensor
 from pytensor.tensor.blockwise import Blockwise, _parse_gufunc_signature
 from pytensor.tensor.nlinalg import MatrixInverse
-from pytensor.tensor.slinalg import Cholesky, Solve
+from pytensor.tensor.slinalg import Cholesky, Solve, cholesky, solve_triangular
 
 
 def test_vectorize_blockwise():
@@ -270,3 +270,41 @@ class TestSolveVector(BlockwiseOpTester):
 class TestSolveMatrix(BlockwiseOpTester):
     core_op = Solve(lower=True, b_ndim=2)
     signature = "(m, m),(m, n) -> (m, n)"
+
+
+@pytest.mark.parametrize(
+    "mu_batch_shape", [(), (1000,), (4, 1000)], ids=lambda arg: f"mu:{arg}"
+)
+@pytest.mark.parametrize(
+    "cov_batch_shape", [(), (1000,), (4, 1000)], ids=lambda arg: f"cov:{arg}"
+)
+def test_batched_mvnormal_logp_and_dlogp(mu_batch_shape, cov_batch_shape, benchmark):
+    rng = np.random.default_rng(sum(map(ord, "batched_mvnormal")))
+
+    value_batch_shape = mu_batch_shape
+    if len(cov_batch_shape) > len(mu_batch_shape):
+        value_batch_shape = cov_batch_shape
+
+    value = tensor("value", shape=(*value_batch_shape, 10))
+    mu = tensor("mu", shape=(*mu_batch_shape, 10))
+    cov = tensor("cov", shape=(*cov_batch_shape, 10, 10))
+
+    test_values = [
+        rng.normal(size=value.type.shape),
+        rng.normal(size=mu.type.shape),
+        np.eye(cov.type.shape[-1]) * np.abs(rng.normal(size=cov.type.shape)),
+    ]
+
+    chol_cov = cholesky(cov, lower=True, on_error="raise")
+    delta_trans = solve_triangular(chol_cov, value - mu, b_ndim=1)
+    quaddist = (delta_trans**2).sum(axis=-1)
+    diag = diagonal(chol_cov, axis1=-2, axis2=-1)
+    logdet = log(diag).sum(axis=-1)
+    k = value.shape[-1]
+    norm = -0.5 * k * (np.log(2 * np.pi))
+
+    logp = norm - 0.5 * quaddist - logdet
+    dlogp = grad(logp.sum(), wrt=[value, mu, cov])
+
+    fn = pytensor.function([value, mu, cov], [logp, *dlogp])
+    benchmark(fn, *test_values)