X-Git-Url: https://fleuret.org/cgi-bin/gitweb/gitweb.cgi?a=blobdiff_plain;f=tasks.py;h=51538366383be455f160ab6158392627ecea5190;hb=19ec7f3e4030ddece2647983dcf1bed5eb0d9544;hp=fddcaff34994d31bdb4837772d42ddc4f40d0727;hpb=9eadd2cd6913a0de53b4b0f526157497e8d14381;p=picoclvr.git

diff --git a/tasks.py b/tasks.py
index fddcaff..5153836 100755
--- a/tasks.py
+++ b/tasks.py
@@ -1938,8 +1938,13 @@ class Escape(Task):
             range(it_len, result.size(1) - it_len + 1, it_len), desc="thinking"
         ):
             # Put the lookahead reward to either 0 or -1 for the
-            # current iteration, sample the next state
-            s = -(torch.rand(result.size(0), device=result.device) < 0.2).long()
+            # current iteration, with a proba that depends with the
+            # sequence index, so that we have diverse examples, sample
+            # the next state
+            s = -(
+                torch.rand(result.size(0), device=result.device)
+                <= torch.linspace(0, 1, result.size(0), device=result.device)
+            ).long()
             result[:, u - 1] = s + 1 + escape.first_lookahead_rewards_code
             ar_mask = (t >= u).long() * (t < u + state_len).long()
             ar(result, ar_mask)
@@ -1956,6 +1961,7 @@ class Escape(Task):
                 # Extract the rewards
                 r = result[:, range(v + state_len + 1 + it_len, u + it_len - 1, it_len)]
                 r = r - escape.first_rewards_code - 1
+                r = r.clamp(min=-1, max=1)  # the reward is predicted hence can be weird
                 a = r.min(dim=1).values
                 b = r.max(dim=1).values
                 s = (a < 0).long() * a + (a >= 0).long() * b