update readme about batch inference

README_CN.md

@@ -359,18 +359,26 @@ model = AutoModelForCausalLM.from_pretrained(
 
 ## Batch推理
 千问支持batch批量推理。在开启flash-attention的状态下，使用batch推理可以约40%的提速。示例代码如下所示：
-```
+```python
 import torch
-from tokenization_qwen import QWenTokenizer
-from modeling_qwen import QWenLMHeadModel
+from transformers import AutoModelForCausalLM, AutoTokenizer
 from transformers import GenerationConfig
 from qwen_generation_utils import make_context, decode_tokens, get_stop_words_ids
 
-
-tokenizer = QWenTokenizer.from_pretrained('./', pad_token='<|extra_0|>', eos_token='<|endoftext|>', padding_side='left')
-model = QWenLMHeadModel.from_pretrained('./', device_map="auto").eval()
-model.generation_config = GenerationConfig.from_pretrained('./')
-stop_words_ids = get_stop_words_ids(model.generation_config.chat_format, tokenizer)
+tokenizer = AutoTokenizer.from_pretrained(
+    './',
+    pad_token='<|extra_0|>',
+    eos_token='<|endoftext|>',
+    padding_side='left',
+    trust_remote_code=True
+)
+model = AutoModelForCausalLM.from_pretrained(
+    './',
+    pad_token_id=tokenizer.pad_token_id,
+    device_map="auto",
+    trust_remote_code=True
+).eval()
+model.generation_config = GenerationConfig.from_pretrained('./', pad_token_id=tokenizer.pad_token_id)
 
 all_raw_text = ["我想听你说爱我。", "今天我想吃点啥，甜甜的，推荐下", "我马上迟到了，怎么做才能不迟到"]
 batch_raw_text = []
@@ -388,7 +396,6 @@ batch_input_ids = tokenizer(batch_raw_text, padding='longest')
 batch_input_ids = torch.LongTensor(batch_input_ids['input_ids']).to(model.device)
 batch_out_ids = model.generate(
     batch_input_ids,
-    stop_words_ids=stop_words_ids,
     return_dict_in_generate=False,
     generation_config=model.generation_config
 )
@@ -399,7 +406,7 @@ batch_response = [
         batch_out_ids[i][padding_lens[i]:],
         tokenizer,
         raw_text_len=len(batch_raw_text[i]),
-        context_length=batch_input_ids[i].size(0),
+        context_length=(batch_input_ids[i].size(0)-padding_lens[i]),
         chat_format="chatml",
         verbose=False,
         errors='replace'