[LLM]Reopen autotp generate_stream (#11120)

* reopen autotp generate_stream

* fix style error

* update

python/llm/example/GPU/Deepspeed-AutoTP-FastAPI/README.md

@@ -58,6 +58,8 @@ If you successfully run the serving, you can get output like this:
 
 We can use `curl` to test serving api
 
+#### generate()
+
 ```bash
 # Set http_proxy and https_proxy to null to ensure that requests are not forwarded by a proxy.
 export http_proxy=
@@ -77,10 +79,68 @@ And you should get output like this:
 
 ```json
 {
-  "generated_text": "What is AI? Artificial intelligence (AI) refers to the development of computer systems able to perform tasks that would normally require human intelligence, such as visual perception, speech",
+  "index": 0,
-  "generate_time": "0.45149803161621094s"
+  "message": {
+    "role": "assistant",
+    "content": "\n\nArtificial intelligence (AI) is a branch of computer science that deals with the creation of intelligent machines that can perform tasks that typically "
+  },
+  "finish_reason": "stop"
 }
 
+```
+#### generate_stream()
+```bash
+# Set http_proxy and https_proxy to null to ensure that requests are not forwarded by a proxy.
+export http_proxy=
+export https_proxy=
+
+curl -X 'POST' \
+  'http://127.0.0.1:8000/generate_stream/' \
+  -H 'accept: application/json' \
+  -H 'Content-Type: application/json' \
+  -d '{
+  "prompt": "What is AI?",
+  "n_predict": 32
+}'
+```
+
+And you should get output like this:
+```json
+{"index": 0, "message": {"role": "assistant", "content": "\n"}, "finish_reason": null}
+{"index": 1, "message": {"role": "assistant", "content": "\n"}, "finish_reason": null}
+{"index": 2, "message": {"role": "assistant", "content": ""}, "finish_reason": null}
+{"index": 3, "message": {"role": "assistant", "content": ""}, "finish_reason": null}
+{"index": 4, "message": {"role": "assistant", "content": ""}, "finish_reason": null}
+{"index": 5, "message": {"role": "assistant", "content": "Artificial "}, "finish_reason": null}
+{"index": 6, "message": {"role": "assistant", "content": "intelligence "}, "finish_reason": null}
+{"index": 7, "message": {"role": "assistant", "content": ""}, "finish_reason": null}
+{"index": 8, "message": {"role": "assistant", "content": ""}, "finish_reason": null}
+{"index": 9, "message": {"role": "assistant", "content": "(AI) "}, "finish_reason": null}
+{"index": 10, "message": {"role": "assistant", "content": "is "}, "finish_reason": null}
+{"index": 11, "message": {"role": "assistant", "content": "a "}, "finish_reason": null}
+{"index": 12, "message": {"role": "assistant", "content": "branch "}, "finish_reason": null}
+{"index": 13, "message": {"role": "assistant", "content": "of "}, "finish_reason": null}
+{"index": 14, "message": {"role": "assistant", "content": "computer "}, "finish_reason": null}
+{"index": 15, "message": {"role": "assistant", "content": "science "}, "finish_reason": null}
+{"index": 16, "message": {"role": "assistant", "content": "that "}, "finish_reason": null}
+{"index": 17, "message": {"role": "assistant", "content": ""}, "finish_reason": null}
+{"index": 18, "message": {"role": "assistant", "content": "deals "}, "finish_reason": null}
+{"index": 19, "message": {"role": "assistant", "content": "with "}, "finish_reason": null}
+{"index": 20, "message": {"role": "assistant", "content": "the "}, "finish_reason": null}
+{"index": 21, "message": {"role": "assistant", "content": "creation "}, "finish_reason": null}
+{"index": 22, "message": {"role": "assistant", "content": "of "}, "finish_reason": null}
+{"index": 23, "message": {"role": "assistant", "content": ""}, "finish_reason": null}
+{"index": 24, "message": {"role": "assistant", "content": "intelligent "}, "finish_reason": null}
+{"index": 25, "message": {"role": "assistant", "content": "machines "}, "finish_reason": null}
+{"index": 26, "message": {"role": "assistant", "content": "that "}, "finish_reason": null}
+{"index": 27, "message": {"role": "assistant", "content": "can "}, "finish_reason": null}
+{"index": 28, "message": {"role": "assistant", "content": "perform "}, "finish_reason": null}
+{"index": 29, "message": {"role": "assistant", "content": "tasks "}, "finish_reason": null}
+{"index": 30, "message": {"role": "assistant", "content": "that "}, "finish_reason": null}
+{"index": 31, "message": {"role": "assistant", "content": "typically "}, "finish_reason": null}
+{"index": 32, "message": {"role": "assistant", "content": null}, "finish_reason": "length"}
+
+
 ```
 
 **Important**: The first token latency is much larger than rest token latency, you could use [our benchmark tool](https://github.com/intel-analytics/ipex-llm/blob/main/python/llm/dev/benchmark/README.md) to obtain more details about first and rest token latency.

python/llm/example/GPU/Deepspeed-AutoTP-FastAPI/serving.py

@@ -18,17 +18,25 @@ import os
 import torch
 import transformers
 import time
+import json
 import argparse
 import torch.distributed as dist
 
 from fastapi import FastAPI, HTTPException
+from fastapi.responses import StreamingResponse
+
 from pydantic import BaseModel
 import uvicorn
+from threading import Thread
+from ipex_llm.transformers.streamer import BatchTextIteratorStreamer
+
 
 import asyncio, uuid
+from collections import deque
 from typing import Dict, List, Optional
 
 from transformers.utils import logging
+
 logger = logging.get_logger(__name__)
 
 from ipex_llm.utils.benchmark_util import BenchmarkWrapper
@@ -42,17 +50,31 @@ def get_int_from_env(env_keys, default):
             return val
     return int(default)
 
+
 global max_num_seqs
 global max_num_batched_tokens
 
-local_rank = get_int_from_env(["LOCAL_RANK","PMI_RANK"], "0")
+local_rank = get_int_from_env(["LOCAL_RANK", "PMI_RANK"], "0")
-world_size = get_int_from_env(["WORLD_SIZE","PMI_SIZE"], "1")
+world_size = get_int_from_env(["WORLD_SIZE", "PMI_SIZE"], "1")
 os.environ["RANK"] = str(local_rank)
 os.environ["WORLD_SIZE"] = str(world_size)
 os.environ["MASTER_PORT"] = os.environ.get("MASTER_PORT", "29500")
 
 global model, tokenizer
 
+
+class PromptRequest(BaseModel):
+    prompt: str
+    n_predict: int = 32
+
+
+rest_req_deque = deque(maxlen=128)
+request_queue: asyncio.Queue = asyncio.Queue()
+result_dict: Dict[str, str] = {}
+streamer_dict = {}
+empty_req = PromptRequest(prompt="", n_predict=0)
+
+
 def load_model(model_path, low_bit):
 
     from ipex_llm import optimize_model
@@ -61,7 +83,9 @@ def load_model(model_path, low_bit):
     import time
     import argparse
 
-    from transformers import AutoModelForCausalLM  # export AutoModelForCausalLM from transformers so that deepspeed use it
+    from transformers import (
+        AutoModelForCausalLM,
+    )  # export AutoModelForCausalLM from transformers so that deepspeed use it
     from transformers import LlamaTokenizer, AutoTokenizer
     import deepspeed
     from deepspeed.accelerator.cpu_accelerator import CPU_Accelerator
@@ -73,12 +97,14 @@ def load_model(model_path, low_bit):
     current_accel = CPU_Accelerator()
     set_accelerator(current_accel)
     global model, tokenizer
-    model = AutoModelForCausalLM.from_pretrained(model_path,
+    model = AutoModelForCausalLM.from_pretrained(
+        model_path,
         device_map={"": "cpu"},
         low_cpu_mem_usage=True,
         torch_dtype=torch.float16,
         trust_remote_code=True,
-                                                 use_cache=True)
+        use_cache=True,
+    )
 
     model = deepspeed.init_inference(
         model,
@@ -89,14 +115,14 @@ def load_model(model_path, low_bit):
 
     # Use IPEX-LLM `optimize_model` to convert the model into optimized low bit format
     # Convert the rest of the model into float16 to reduce allreduce traffic
-    model = optimize_model(model.module.to(f'cpu'), low_bit=low_bit).to(torch.float16)
+    model = optimize_model(model.module.to(f"cpu"), low_bit=low_bit).to(torch.float16)
 
     # Next, use XPU as accelerator to speed up inference
     current_accel = XPU_Accelerator()
     set_accelerator(current_accel)
 
     # Move model back to xpu
-    model = model.to(f'xpu:{local_rank}')
+    model = model.to(f"xpu:{local_rank}")
     model = BenchmarkWrapper(model)
 
     # Modify backend related settings
@@ -104,55 +130,156 @@ def load_model(model_path, low_bit):
         get_accelerator().set_device(local_rank)
     dist_backend = get_accelerator().communication_backend_name()
     import deepspeed.comm.comm
+
     deepspeed.comm.comm.cdb = None
     from deepspeed.comm.comm import init_distributed
+
     init_distributed()
 
     # Load tokenizer
-    tokenizer = AutoTokenizer.from_pretrained(model_path, trust_remote_code=True, padding_side='left')
+    tokenizer = AutoTokenizer.from_pretrained(
+        model_path, trust_remote_code=True, padding_side="left"
+    )
     if tokenizer.pad_token is None:
         tokenizer.pad_token = tokenizer.eos_token
 
-def generate_text(prompt: List[str], n_predict = 32):
+
+async def generate_stream_gate(prompt: List[str], n_predict=32, request_ids=[]):
     while prompt[-1] == "":
         prompt = prompt[:-1]
     if isinstance(n_predict, list):
         n_predict = max(n_predict)
 
     inputs = tokenizer(prompt, return_tensors="pt", padding=True)
-    input_ids = inputs.input_ids.to(f'xpu:{local_rank}')
+    input_ids = inputs.input_ids.to(f"xpu:{local_rank}")
-    # print(input_ids)
+    attention_mask = inputs.attention_mask.to(f"xpu:{local_rank}")
-    attention_mask = inputs.attention_mask.to(f'xpu:{local_rank}')
+
-    output = model.generate(input_ids,
+    for request_id in request_ids:
-                            attention_mask=attention_mask,
+        if request_id not in streamer_dict:
+            streamer_dict[request_id] = asyncio.Queue()
+
+    streamer = BatchTextIteratorStreamer(
+        tokenizer=tokenizer,
+        timeout=600,
+        skip_prompt=True,
+        skip_special_tokens=True,
+        batch_size=len(prompt),
+    )
+
+    generated_kwargs = dict(
         max_new_tokens=n_predict,
-                            use_cache=True)
+        min_new_tokens=n_predict,
+        streamer=streamer,
+        attention_mask=attention_mask,
+        do_sample=False,
+    )
+
+    def model_generate():
+        model.generate(input_ids, **generated_kwargs)
+        torch.xpu.empty_cache()
         torch.xpu.synchronize()
-    return output
 
+    t1 = Thread(target=model_generate)
+    t1.start()
 
-class PromptRequest(BaseModel):
+    stopped = False
-    prompt: str
+
-    n_predict: int = 32  
+    async def put_item(queue, item):
+        await queue.put(item)
+
+    for i in range(n_predict):
+        tasks = []
+        try:
+            output_token = next(streamer)
+        except StopIteration:
+            stopped = True
+        for index, request_id in enumerate(request_ids):
+            task = asyncio.create_task(
+                put_item(
+                    streamer_dict[request_id],
+                    (0 if stopped else n_predict - 1 - i, output_token[index]),
+                )
+            )
+            tasks.append(task)
+        await asyncio.gather(*tasks)
+        if stopped:
+            break
 
-empty_req = PromptRequest(prompt="", n_predict=0)
 
 app = FastAPI()
 
-from collections import deque
+
-rest_req_deque = deque(maxlen=128)
+async def stream_generator(token_queue, request_id):
-request_queue: asyncio.Queue = asyncio.Queue()
+    index = 0
-result_dict: Dict[str, str] = {}
+    while True:
+        if not token_queue.empty():
+            remain, token = await token_queue.get()
+            response = {
+                "index": index,
+                "message": {"role": "assistant", "content": token},
+                "finish_reason": None,
+            }
+            yield json.dumps(response) + "\n"
+            index = index + 1
+            if remain == 0:
+                response = {
+                    "index": index,
+                    "message": {"role": "assistant", "content": None},
+                    "finish_reason": "length",
+                }
+                yield json.dumps(response) + "\n"
+                break
+        else:
+            await asyncio.sleep(0)
+    streamer_dict.pop(request_id, None)
+
+
+async def generator(token_queue, request_id):
+    while True:
+        if not token_queue.empty():
+            remain, token = await token_queue.get()
+            yield token
+            if remain == 0:
+                break
+        else:
+            await asyncio.sleep(0)
+    streamer_dict.pop(request_id, None)
+
 
 @app.post("/generate/")
 async def generate(prompt_request: PromptRequest):
     request_id = str(uuid.uuid4())
     await request_queue.put((request_id, prompt_request))
     while True:
-        await asyncio.sleep(0.1)
+        await asyncio.sleep(0)
-        if request_id in result_dict:
+        if request_id in streamer_dict:
-            output_str = result_dict.pop(request_id)
+            output_str = []
-            return {"generated_text": output_str}
+            token_queue = streamer_dict[request_id]
+            async for item in generator(token_queue, request_id):
+                output_str.append(item)
+
+            return {
+                "index": 0,
+                "message": {
+                    "role": "assistant",
+                    "content": "".join(output_str),
+                },
+                "finish_reason": "stop",
+            }
+
+
+@app.post("/generate_stream/")
+async def generate_stream(prompt_request: PromptRequest):
+    request_id = str(uuid.uuid4()) + "stream"
+    await request_queue.put((request_id, prompt_request))
+    while True:
+        await asyncio.sleep(0)
+        if request_id in streamer_dict:
+            token_queue = streamer_dict[request_id]
+
+            return StreamingResponse(
+                stream_generator(token_queue, request_id), media_type="application/json"
+            )
 
 
 async def process_requests():
@@ -164,7 +291,9 @@ async def process_requests():
             while rest_req_deque:
                 request_id, rest_request = rest_req_deque.popleft()
                 prompt = rest_request.prompt
-                cur_prompt_len = tokenizer(prompt_request.prompt, return_tensors="pt").input_ids.size(1)
+                cur_prompt_len = tokenizer(
+                    prompt_request.prompt, return_tensors="pt"
+                ).input_ids.size(1)
                 cur_batched_tokens += cur_prompt_len
                 if cur_batched_tokens > max_num_batched_tokens:
                     cur_batched_tokens -= cur_prompt_len
@@ -179,9 +308,9 @@ async def process_requests():
                 if request_queue.empty():
                     break
                 request_id, prompt_request = await request_queue.get()
-                # import pdb
+                cur_prompt_len = tokenizer(
-                # pdb.set_trace()
+                    prompt_request.prompt, return_tensors="pt"
-                cur_prompt_len = tokenizer(prompt_request.prompt, return_tensors="pt").input_ids.size(1)
+                ).input_ids.size(1)
                 cur_batched_tokens += cur_prompt_len
                 if cur_batched_tokens > max_num_batched_tokens:
                     cur_batched_tokens -= cur_prompt_len
@@ -193,21 +322,28 @@ async def process_requests():
         if local_rank == 0 and prompt_requests:
             object_list = prompt_requests
             if len(object_list) < max_num_seqs:
-                object_list = object_list + [empty_req] * (max_num_seqs - len(object_list))
+                object_list = object_list + [empty_req] * (
-            logger.info(f"Running: {len(prompt_requests)}, Pending: {request_queue.qsize()}")
+                    max_num_seqs - len(object_list)
+                )
+            logger.info(
+                f"Running: {len(prompt_requests)}, Pending: {request_queue.qsize()}"
+            )
             dist.broadcast_object_list(object_list, src=0)
+
             start_time = time.time()
-            outputs = generate_text([req.prompt for req in object_list], [req.n_predict for req in object_list])
+            await generate_stream_gate(
+                [req.prompt for req in object_list],
+                [req.n_predict for req in object_list],
+                request_ids,
+            )
+
             generate_time = time.time() - start_time
-            outputs = outputs.cpu()
-            output_strs = tokenizer.batch_decode(outputs, skip_special_tokens=True)
-            output_strs = output_strs[:len(prompt_requests)]
 
-            for request_id, output_str in zip(request_ids, output_strs):
+            logger.info(
-                result_dict[request_id] = output_str
+                f"First token latency: {model.first_cost}, next token latency: {model.rest_cost_mean}, generate time: {generate_time}"
-            logger.info(f"First token latency: {model.first_cost}, next token latency: {model.rest_cost_mean}, generate time: {generate_time}")
+            )
 
-        await asyncio.sleep(0.1)
+        await asyncio.sleep(0)
 
 
 @app.on_event("startup")
@@ -216,19 +352,44 @@ async def startup_event():
         asyncio.create_task(process_requests())
 
 
-if __name__ == "__main__":
+async def main():
-    parser = argparse.ArgumentParser(description='Predict Tokens using fastapi by leveraging DeepSpeed-AutoTP')
+    parser = argparse.ArgumentParser(
-    parser.add_argument('--repo-id-or-model-path', type=str, default="meta-llama/Llama-2-7b-chat-hf",
+        description="Predict Tokens using fastapi by leveraging DeepSpeed-AutoTP"
-                        help='The huggingface repo id for the Llama2 (e.g. `meta-llama/Llama-2-7b-chat-hf`, `meta-llama/Llama-2-13b-chat-hf` and `meta-llama/Llama-2-70b-chat-hf`) to be downloaded'
+    )
-                             ', or the path to the huggingface checkpoint folder')
+    parser.add_argument(
-    parser.add_argument('--low-bit', type=str, default='sym_int4',
+        "--repo-id-or-model-path",
-                    help='The quantization type the model will convert to.')
+        type=str,
-    parser.add_argument('--port', type=int, default=8000,
+        default="meta-llama/Llama-2-7b-chat-hf",
-                    help='The port number on which the server will run.')
+        help="The huggingface repo id for the Llama2 (e.g. `meta-llama/Llama-2-7b-chat-hf`, `meta-llama/Llama-2-13b-chat-hf` and `meta-llama/Llama-2-70b-chat-hf`) to be downloaded"
-    parser.add_argument('--max-num-batched-tokens', type=int, default=4096,
+        ", or the path to the huggingface checkpoint folder",
-                    help='Max tokens can be batched by this service.')
+    )
-    parser.add_argument('--max-num-seqs', type=int, default=8,
+    parser.add_argument(
-                    help='Max requests can be batched by this service.')
+        "--low-bit",
+        type=str,
+        default="sym_int4",
+        help="The quantization type the model will convert to.",
+    )
+    parser.add_argument(
+        "--port",
+        type=int,
+        default=8000,
+        help="The port number on which the server will run.",
+    )
+    parser.add_argument(
+        "--max-num-batched-tokens",
+        type=int,
+        default=4096,
+        help="Max tokens can be batched by this service.",
+    )
+    parser.add_argument(
+        "--max-num-seqs",
+        type=int,
+        default=8,
+        help="Max requests can be batched by this service.",
+    )
+
+    global max_num_seqs
+    global max_num_batched_tokens
 
     args = parser.parse_args()
     model_path = args.repo_id_or_model_path
@@ -236,10 +397,21 @@ if __name__ == "__main__":
     max_num_seqs = args.max_num_seqs
     max_num_batched_tokens = args.max_num_batched_tokens
     load_model(model_path, low_bit)
+
+    config = uvicorn.Config(app=app, host="0.0.0.0", port=args.port)
+    server = uvicorn.Server(config)
+
     if local_rank == 0:
-        uvicorn.run(app, host="0.0.0.0", port=args.port)
+        await server.serve()
     else:
         while True:
             object_list = [None] * max_num_seqs
             dist.broadcast_object_list(object_list, src=0)
-            output = generate_text([req.prompt for req in object_list], [req.n_predict for req in object_list])
+            await generate_stream_gate(
+                [req.prompt for req in object_list],
+                [req.n_predict for req in object_list],
+            )
+
+
+if __name__ == "__main__":
+    asyncio.run(main())

python/llm/example/GPU/Deepspeed-AutoTP-FastAPI/start-deepspeed-autotp-ipex-llm-serving.sh

@@ -33,5 +33,4 @@ export TORCH_LLM_ALLREDUCE=0
 export WORLD_SIZE=2
 
 mpirun -np $NUM_GPUS --prepend-rank \
-        python serving.py --repo-id-or-model-path YOUR_REPO_ID_OR_MODEL_PATH --low-bit 'sym_int4' --port 8000 --max-num-seqs 8 --max-num-batched-tokens 8192
+        python serving.py --repo-id-or-model-path YOUR_REPO_ID_OR_MODEL_PATH --low-bit 'fp8' --port 8000 --max-num-seqs 8 --max-num-batched-tokens 8192
-

python/llm/src/ipex_llm/transformers/streamer.py

@@ -0,0 +1,114 @@
+#
+# Copyright 2016 The BigDL Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# Some parts of this file is adapted from
+# https://github.com/huggingface/transformers/blob/main/src/transformers/generation/streamers.py
+#
+
+from typing import Optional, List
+
+import torch
+from transformers import TextIteratorStreamer
+
+
+class BatchTextIteratorStreamer(TextIteratorStreamer):
+    """
+    A specialized version of TextIteratorStreamer that handles text streams in batches, providing
+    an efficient way to process large volumes of text data asynchronously. This class is designed
+    to aggregate multiple texts into batches, making it ideal for applications that need to
+    perform batch operations on streamed text data, such as bulk text processing or machine
+    learning model inference in an interactive environment.
+
+        Parameters:
+                tokenizer (`AutoTokenizer`):
+                        The tokenized used to decode the tokens.
+                skip_prompt (`bool`, *optional*, defaults to `False`):
+                        Whether to skip the prompt to `.generate()` or not.
+                timeout (`float`, *optional*):
+                        The timeout for the text queue. If `None`, the queue will
+                        block indefinitely. Useful to handle exceptions
+                        in `.generate()`, when it is called in a separate thread.
+                decode_kwargs (`dict`, *optional*):
+                        Additional keyword arguments to pass to the tokenizer's `decode` method.
+                batch_size(`int`)
+                        The size of the batches to process. This parameter must be specified and
+                        determines how many texts are processed together as a single batch.
+    """
+
+    def __init__(
+        self,
+        batch_size: int,
+        tokenizer: "AutoTokenizer",
+        skip_prompt: bool = False,
+        timeout: Optional[float] = None,
+        **decode_kwargs
+    ):
+        super().__init__(tokenizer, skip_prompt, timeout, **decode_kwargs)
+        self.batch_size = batch_size
+        self.token_cache = [[] for _ in range(batch_size)]
+        self.print_len = [0 for _ in range(batch_size)]
+        self.generate_exception = None
+
+    def put(self, value):
+        if len(value.shape) != 2:
+            value = torch.reshape(
+                value, (self.batch_size, value.shape[0] // self.batch_size)
+            )
+
+        if self.skip_prompt and self.next_tokens_are_prompt:
+            self.next_tokens_are_prompt = False
+            return
+
+        printable_texts = list()
+        for idx in range(self.batch_size):
+            self.token_cache[idx].extend(value[idx].tolist())
+            text = self.tokenizer.decode(self.token_cache[idx], **self.decode_kwargs)
+
+            if text.endswith("\n"):
+                printable_text = text[self.print_len[idx]:]
+                self.token_cache[idx] = []
+                self.print_len[idx] = 0
+                # If the last token is a CJK character, we print the characters.
+            elif len(text) > 0 and self._is_chinese_char(ord(text[-1])):
+                printable_text = text[self.print_len[idx]:]
+                self.print_len[idx] += len(printable_text)
+            else:
+                printable_text = text[self.print_len[idx]:text.rfind(" ") + 1]
+                self.print_len[idx] += len(printable_text)
+            printable_texts.append(printable_text)
+
+        self.on_finalized_text(printable_texts)
+
+    def end(self):
+        printable_texts = list()
+        for idx in range(self.batch_size):
+            if len(self.token_cache[idx]) > 0:
+                text = self.tokenizer.decode(
+                    self.token_cache[idx], **self.decode_kwargs
+                )
+                printable_text = text[self.print_len[idx]:]
+                self.token_cache[idx] = []
+                self.print_len[idx] = 0
+            else:
+                printable_text = ""
+            printable_texts.append(printable_text)
+
+        self.next_tokens_are_prompt = True
+        self.on_finalized_text(printable_texts, stream_end=True)
+
+    def on_finalized_text(self, texts: List[str], stream_end: bool = False):
+        self.text_queue.put(texts, timeout=self.timeout)
+        if stream_end:
+            self.text_queue.put(self.stop_signal, timeout=self.timeout)