Remove gammainc(c) safeguards in logcdf methods of Gamma and InverseGamma

Closes pymc-devs#4467

Author: ricardoV94

pymc3/distributions/continuous.py

@@ -2392,13 +2392,8 @@ def logcdf(value, alpha, inv_beta):
         """
         beta = at.inv(inv_beta)
 
-        # Avoid C-assertion when the gammainc function is called with invalid values (#4340)
-        safe_alpha = at.switch(at.lt(alpha, 0), 0, alpha)
-        safe_beta = at.switch(at.lt(beta, 0), 0, beta)
-        safe_value = at.switch(at.lt(value, 0), 0, value)
-
         return bound(
-            at.log(at.gammainc(safe_alpha, safe_beta * safe_value)),
+            at.log(at.gammainc(alpha, beta * value)),
             0 <= value,
             0 < alpha,
             0 < beta,
@@ -2540,13 +2535,9 @@ def logcdf(value, alpha, beta):
         -------
         TensorVariable
         """
-        # Avoid C-assertion when the gammaincc function is called with invalid values (#4340)
-        safe_alpha = at.switch(at.lt(alpha, 0), 0, alpha)
-        safe_beta = at.switch(at.lt(beta, 0), 0, beta)
-        safe_value = at.switch(at.lt(value, 0), 0, value)
 
         return bound(
-            at.log(at.gammaincc(safe_alpha, safe_beta / safe_value)),
+            at.log(at.gammaincc(alpha, beta / value)),
             0 <= value,
             0 < alpha,
             0 < beta,

pymc3/tests/test_distributions.py

@@ -1437,15 +1437,11 @@ def test_fun(value, mu, sigma):
         reason="Fails on float32 due to numerical issues",
     )
     def test_gamma_logcdf(self):
-        # pymc-devs/aesara#224: skip_paramdomain_outside_edge_test has to be set
-        # True to avoid triggering a C-level assertion in the Aesara GammaQ function
-        # in gamma.c file. Can be set back to False (default) once that issue is solved
         self.check_logcdf(
             Gamma,
             Rplus,
             {"alpha": Rplusbig, "beta": Rplusbig},
             lambda value, alpha, beta: sp.gamma.logcdf(value, alpha, scale=1.0 / beta),
-            skip_paramdomain_outside_edge_test=True,
         )
 
     def test_inverse_gamma_logp(self):
@@ -1455,23 +1451,17 @@ def test_inverse_gamma_logp(self):
             {"alpha": Rplus, "beta": Rplus},
             lambda value, alpha, beta: sp.invgamma.logpdf(value, alpha, scale=beta),
         )
-        # pymc-devs/aesara#224: skip_paramdomain_outside_edge_test has to be set
-        # True to avoid triggering a C-level assertion in the Aesara GammaQ function
 
     @pytest.mark.xfail(
         condition=(aesara.config.floatX == "float32"),
         reason="Fails on float32 due to numerical issues",
     )
     def test_inverse_gamma_logcdf(self):
-        # pymc-devs/aesara#224: skip_paramdomain_outside_edge_test has to be set
-        # True to avoid triggering a C-level assertion in the Aesara GammaQ function
-        # in gamma.c file. Can be set back to False (default) once that issue is solved
         self.check_logcdf(
             InverseGamma,
             Rplus,
             {"alpha": Rplus, "beta": Rplus},
             lambda value, alpha, beta: sp.invgamma.logcdf(value, alpha, scale=beta),
-            skip_paramdomain_outside_edge_test=True,
         )
 
     @pytest.mark.xfail(