Disable implicit type conversion during type matching

jax/_src/pallas/triton/lowering.py

@@ -564,7 +564,7 @@ def matches(self, avals: Sequence[jax_core.ShapedArray]) -> bool:
     if len(avals) != len(self.arg_types):
       return False
     return all(
-        aval.weak_type or aval.dtype.name == arg_type
+        aval.dtype.name == arg_type
         for aval, arg_type in zip(avals, self.arg_types)
     )
 

tests/pallas/ops_test.py

@@ -739,6 +739,17 @@ def kernel(x_ref, o_ref):
       x = jnp.array([0.42, 2.4]).astype(dtype)
       np.testing.assert_allclose(kernel(x), fn(x), rtol=1e-6)
 
+  def test_abs_weak_type(self):
+    # see https://github.com/google/jax/issues/23191
+    @functools.partial(
+        self.pallas_call, out_shape=jax.ShapeDtypeStruct((4, 4), jnp.float32),
+    )
+    def kernel(x_ref, o_ref):
+      o_ref[...] = jnp.abs(x_ref[...])
+
+    x = jnp.broadcast_to(-3.2, (4, 4))  # sets `weak_type` to `True`
+    np.testing.assert_allclose(kernel(x), jnp.abs(x), rtol=1e-6)
+
   @parameterized.parameters(
       ("float32", "int32"),
       ("float64", "int32"),