Update.

diff --git a/problems.py b/problems.py
index 51e90ed..675a47a 100755 (executable)
--- a/problems.py
+++ b/problems.py
@@ -308,7 +308,7 @@ class ProblemMixing(Problem):
         x = x.flatten(1)
         u = torch.arange(self.height * self.width).reshape(1, -1)
         m = ((x - u).abs() == 0).long()
-        d = (x - (m * u + (1-m) * self.height * self.width)).abs().sum(-1) + (
+        d = (x - (m * u + (1 - m) * self.height * self.width)).abs().sum(-1) + (
             m.sum(dim=-1) != self.height * self.width // 2
         ).long()
         return d
@@ -386,7 +386,7 @@ class ProblemMixing(Problem):
 ####################
 
 if __name__ == "__main__":
-    p = ProblemMixing(width=4, hard=True)
+    p = ProblemMixing()
     s, m = p.generate_sequences(10000)
     for x in s[:5]:
         print(p.seq2str(x))