BUG: apply from bilby-dev#886 for 1047

Author: mj-will

bilby/core/prior/dict.py

@@ -461,7 +461,7 @@ def check_efficiency(n_tested, n_valid):
                 sample = self.sample_subset(keys=keys, size=size)
                 is_valid = self.evaluate_constraints(sample)
                 n_tested_samples += 1
-                n_valid_samples += int(is_valid)
+                n_valid_samples += int(is_valid.item())
                 check_efficiency(n_tested_samples, n_valid_samples)
                 if is_valid:
                     return sample