Fix unnatural tokenizations if possible

OpenGPTX · Nov 8, 2023 · a69dc1e · a69dc1e
1 parent b05c53d
commit a69dc1e
Showing 1 changed file with 14 additions and 0 deletions.
diff --git a/lm_eval/base.py b/lm_eval/base.py
@@ -180,6 +180,20 @@ def loglikelihood(self, requests):
 
             continuation_enc = self.tok_encode(continuation)
             # continuation_enc = self.tok_encode(continuation, is_continuation=True)
+            context_continuation_enc = self.tok_encode(context + continuation)
+
+            if context_enc + continuation_enc != context_continuation_enc:
+                if context_continuation_enc[: len(context_enc)] == context_enc:
+                    # continuation_enc is incorrect and context_enc is correct
+                    continuation_enc = context_continuation_enc[len(context_enc) :]
+                elif context_continuation_enc[-len(continuation_enc) :] == continuation_enc:
+                    # continuation_enc is correct and context_enc is incorrect
+                    context_enc = context_continuation_enc[: -len(continuation_enc)]
+                else:
+                    # Both are incorrect
+                    print(
+                        f"WARNING: Unnatural tokenization of concatenated context ...{repr(context[-20:])} and continuation {repr(continuation)}"
+                    )
 
             new_reqs.append(((context, continuation), context_enc, continuation_enc))