Add set_seed to Llama class

Author: abetlen

llama_cpp/llama.py

@@ -998,6 +998,15 @@ def set_cache(self, cache: Optional[BaseLlamaCache]):
         """
         self.cache = cache
 
+    def set_seed(self, seed: int):
+        """Set the random seed.
+
+        Args:
+            seed: The random seed.
+        """
+        assert self._ctx.ctx is not None
+        llama_cpp.llama_set_rng_seed(self._ctx.ctx, seed)
+
     def reset(self):
         """Reset the model state."""
         self.n_tokens = 0
@@ -1318,10 +1327,14 @@ def _create_completion(
         completion_tokens: List[int] = []
         # Add blank space to start of prompt to match OG llama tokenizer
         prompt_tokens: List[int] = (
-            self.tokenize(prompt.encode("utf-8"), special=True)
-            if prompt != ""
-            else [self.token_bos()]
-        ) if isinstance(prompt, str) else prompt
+            (
+                self.tokenize(prompt.encode("utf-8"), special=True)
+                if prompt != ""
+                else [self.token_bos()]
+            )
+            if isinstance(prompt, str)
+            else prompt
+        )
         text: bytes = b""
         returned_tokens: int = 0
         stop = (
@@ -1374,7 +1387,7 @@ def _create_completion(
             except KeyError:
                 if self.verbose:
                     print("Llama._create_completion: cache miss", file=sys.stderr)
-        
+
         if seed is not None:
             self._ctx.set_rng_seed(seed)