Fix bug in handling of row/column matrices in GEMV c_code

Bug was caused by reusing the adjusted strides in the logic to decide whether the call to GEMV should be transposed or not. Particularly the +1 in the strides variable was causing the error branch (no double-strides) to be reached wrongly. The +1 was supposedly there for the case of matrix with length 0, but that triggers a branch where the adjusted strides are never used. This bug was introduced in afe934b2

Fix bug in handling of row/column matrices in GEMV c_code
709f745c · Ricardo Vieira · Jesse Grabowski · 86cc3b87 · 709f745c · 709f745c
--- a/pytensor/tensor/blas_c.py
+++ b/pytensor/tensor/blas_c.py
--- a/tests/tensor/test_blas.py
+++ b/tests/tensor/test_blas.py
@@ -2226,8 +2226,10 @@ class TestBlasStrides:

                a.set_value(a_dev.copy()[::a_step], borrow=True)
                b.set_value(b_dev.copy()[::b_step1, ::b_step2], borrow=True)
+                # Copy as C so that it becomes F after the transpose in the graph
                b_t.set_value(
-                    np.transpose(b_dev.copy())[::b_step2, ::b_step1], borrow=True
+                    np.transpose(b_dev).copy(order="C")[::b_step2, ::b_step1],
+                    borrow=True,
                )
                c.set_value(c_dev.copy()[::c_step], borrow=True)

@@ -2244,6 +2246,7 @@ class TestBlasStrides:
        self.cmp_gemv(3, (3, 5), 5, rng)
        self.cmp_gemv(1, (1, 5), 5, rng)
        self.cmp_gemv(3, (3, 1), 1, rng)
+        self.cmp_gemv(1, (1, 1), 1, rng)
        self.cmp_gemv(0, (0, 5), 5, rng)
        self.cmp_gemv(3, (3, 0), 0, rng)
        self.cmp_gemv(0, (0, 1), 1, rng)
@@ -2301,6 +2304,7 @@ class TestBlasStrides:
        self.cmp_ger((3, 5), 3, 5, rng)
        self.cmp_ger((1, 5), 1, 5, rng)
        self.cmp_ger((3, 1), 3, 1, rng)
+        self.cmp_ger((1, 1), 1, 1, rng)
        self.cmp_ger((0, 5), 0, 5, rng)
        self.cmp_ger((3, 0), 3, 0, rng)
        self.cmp_ger((0, 1), 0, 1, rng)

--- a/tests/tensor/test_blas_c.py
+++ b/tests/tensor/test_blas_c.py
@@ -243,6 +243,7 @@ class TestCGemv(OptimizationTestMixin):
        self.t_gemv1((0, 2))
        self.t_gemv1((3, 1))
        self.t_gemv1((3, 0))
+        self.t_gemv1((1, 1))
        self.t_gemv1((1, 0))
        self.t_gemv1((0, 1))
        self.t_gemv1((0, 0))