Fix Cache Key Mismatch for Function Input Signature

- A TensorSpec with no name is now equivalent to a Tensor with the same dtype and shape
- Fixed the shape mismatch issue for Tensors: (11,2) was equal to (1, 12)

PiperOrigin-RevId: 390241221

Author: faizan-m

tensorflow_probability/python/distributions/poisson_test.py

@@ -450,6 +450,12 @@ def testSampleGPU(self):
   def testSampleXLA(self):
     self.skip_if_no_xla()
     if not tf.executing_eagerly(): return  # jit_compile is eager-only.
+
+    # TODO(b/195975508): Reloading the function to reset the cache.
+    if not test_util.JAX_MODE:
+      poisson_lib.random_poisson = tf.function(
+          poisson_lib.random_poisson._python_function)
+
     log_rates = np.random.rand(4, 3).astype(np.float32)
     dist = tfd.Poisson(log_rate=log_rates, validate_args=True)
     # Verify the compile succeeds going all the way through the distribution.