fix(chat): fix stream_chat to return generator (#123)

tools/transformers/modeling_internlm.py

@@ -20,6 +20,7 @@
 """ PyTorch InternLM model."""
 import math
 from typing import List, Optional, Tuple, Union
+import threading, queue
 
 import torch
 import torch.utils.checkpoint
@@ -810,35 +811,70 @@ class InternLMForCausalLM(InternLMPreTrainedModel):
                     temperature: float = 0.8,
                     top_p: float = 0.8,
                     **kwargs):
+        """
+        Return a generator in format: (response, history)
+        Eg.
+        ('你好，有什么可以帮助您的吗', [('你好', '你好，有什么可以帮助您的吗')])
+        ('你好，有什么可以帮助您的吗？', [('你好', '你好，有什么可以帮助您的吗？')])
+        """
+
+        response_queue = queue.Queue(maxsize=20)
+
         class ChatStreamer(BaseStreamer):
             def __init__(self, tokenizer) -> None:
                 super().__init__()
                 self.tokenizer = tokenizer
-                
+                self.queue = response_queue
+                self.query = query
+                self.history = history
+                self.response = ""
+                self.received_inputs = False
+                self.queue.put((self.response, history + [(self.query, self.response)]))
+
             def put(self, value):
                 if len(value.shape) > 1 and value.shape[0] > 1:
                     raise ValueError("ChatStreamer only supports batch size 1")
                 elif len(value.shape) > 1:
                     value = value[0]
+
+                if not self.received_inputs:
+                    # The first received value is input_ids, ignore here
+                    self.received_inputs = True
+                    return
+
                 token = self.tokenizer.decode([value[-1]], skip_special_tokens=True)
                 if token.strip() != "<eoa>":
-                    print(token, end="")
-                
+                    self.response = self.response + token
+                    history = self.history + [(self.query, self.response)]
+                    self.queue.put((self.response, history))
+
             def end(self):
-                print("")
-            
-        return self.chat(
-            tokenizer=tokenizer,
-            query=query,
-            streamer=ChatStreamer(tokenizer=tokenizer),
-            history=history, 
-            max_new_tokens=max_new_tokens,
-            do_sample=do_sample,
-            temperature=temperature,
-            top_p=top_p,
-            **kwargs
-        )
-                
+                self.queue.put(None)
+
+        def stream_producer():
+            return self.chat(
+                tokenizer=tokenizer,
+                query=query,
+                streamer=ChatStreamer(tokenizer=tokenizer),
+                history=history, 
+                max_new_tokens=max_new_tokens,
+                do_sample=do_sample,
+                temperature=temperature,
+                top_p=top_p,
+                **kwargs
+            )
+
+        def consumer():
+            producer = threading.Thread(target=stream_producer)
+            producer.start()
+            while True:
+                res = response_queue.get()
+                if res is not None:
+                    return
+                yield res
+
+        return consumer()
+
 
 @add_start_docstrings(
     """