Fix flaky test pymc-devs#5063

The at.slinalg.solve applies the finite-checks also in shape-inference.
Since 00e6eb9 we do shape checks every
time, making this test error out with a 75 % probability.

Author: michaelosthege

pymc/tests/test_step.py

@@ -983,12 +983,11 @@ def test_bad_init_parallel(self):
                 sample(init=None, cores=2, random_seed=1)
             error.match("Initial evaluation")
 
-    @pytest.mark.xfail(reason="Start shape checks that were previously skipped run into ValueError")
     def test_linalg(self, caplog):
         with Model():
             a = Normal("a", size=2, initval=floatX(np.zeros(2)))
             a = at.switch(a > 0, np.inf, a)
-            b = at.slinalg.solve(floatX(np.eye(2)), a)
+            b = at.slinalg.solve(floatX(np.eye(2)), a, check_finite=False)
             Normal("c", mu=b, size=2, initval=floatX(np.r_[0.0, 0.0]))
             caplog.clear()
             trace = sample(20, init=None, tune=5, chains=2, return_inferencedata=False)