fix: segfault when logits_all=False. Closes #1319

Author: abetlen

llama_cpp/llama.py

@@ -535,14 +535,16 @@ def eval(self, tokens: Sequence[int]):
             # Save tokens
             self.input_ids[n_past : n_past + n_tokens] = batch
             # Save logits
-            rows = n_tokens
-            cols = self._n_vocab
-            offset = (
-                0 if self.context_params.logits_all else n_tokens - 1
-            )  # NOTE: Only save the last token logits if logits_all is False
-            self.scores[n_past + offset : n_past + n_tokens, :].reshape(-1)[
-                :
-            ] = self._ctx.get_logits()[offset * cols : rows * cols]
+            if self.context_params.logits_all:
+                rows = n_tokens
+                cols = self._n_vocab
+                logits = self._ctx.get_logits()[: rows * cols]
+                self.scores[n_past : n_past + n_tokens, :].reshape(-1)[: :] = logits
+            else:
+                rows = 1
+                cols = self._n_vocab
+                logits = self._ctx.get_logits()[: rows * cols]
+                self.scores[n_past + n_tokens - 1, :].reshape(-1)[: :] = logits
             # Update n_tokens
             self.n_tokens += n_tokens