Use static shape values in get_vector_length

aesara/tensor/__init__.py

@@ -80,8 +80,9 @@ def get_vector_length(v: TensorLike) -> int:
     if v.type.ndim != 1:
         raise TypeError(f"Argument must be a vector; got {v.type}")
 
-    if v.type.broadcastable[0]:
-        return 1
+    static_shape: Optional[int] = v.type.shape[0]
+    if static_shape is not None:
+        return static_shape
 
     return _get_vector_length(getattr(v.owner, "op", v), v)
 

tests/tensor/test_basic.py

@@ -1177,6 +1177,8 @@ def test_get_vector_length():
     # Test `Alloc`s
     assert 3 == get_vector_length(alloc(0, 3))
 
+    assert 5 == get_vector_length(tensor(np.float64, shape=(5,)))
+
 
 class TestJoinAndSplit:
     # Split is tested by each verify_grad method.