support session-based training (#4313)

Co-authored-by: Yuanchen Xu <yuanchen.xu00@gmail.com>

applications/Chat/coati/dataset/conversation.py

+#    Copyright 2023 lm-sys@FastChat
+#
+#    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.
+
+import dataclasses
+from enum import Enum, auto
+from typing import List
+
+
+class SeparatorStyle(Enum):
+    ADD_EOS_TOKEN = auto()
+
+
+@dataclasses.dataclass
+class Conversation:
+    system: str
+    roles: List[str]
+    messages: List[List[str]]
+    offset: int
+    sep_style: SeparatorStyle = SeparatorStyle.ADD_EOS_TOKEN
+    sep: str = "</s>"
+
+    skip_next: bool = False
+
+    def get_prompt(self):
+        if self.sep_style == SeparatorStyle.ADD_EOS_TOKEN:
+            ret = self.system
+            for role, message in self.messages:
+                if message:
+                    ret += role + ": " + message + self.sep
+                else:
+                    ret += role + ": "
+            return ret
+        else:
+            raise ValueError(f"Invalid style: {self.sep_style}")
+
+    def append_message(self, role, message):
+        self.messages.append([role, message])
+
+    def to_gradio_chatbot(self):
+        ret = []
+        for i, (role, msg) in enumerate(self.messages[self.offset:]):
+            if i % 2 == 0:
+                ret.append([msg, None])
+            else:
+                ret[-1][-1] = msg
+        return ret
+
+    def copy(self):
+        return Conversation(system=self.system,
+                            roles=self.roles,
+                            messages=[[x, y] for x, y in self.messages],
+                            offset=self.offset,
+                            sep_style=self.sep_style,
+                            sep=self.sep)
+
+    def dict(self):
+        return {
+            "system": self.system,
+            "roles": self.roles,
+            "messages": self.messages,
+            "offset": self.offset,
+            "sep": self.sep
+        }
+
+
+conv = Conversation(
+    system="A chat between a curious human and an artificial intelligence assistant. "
+    "The assistant gives helpful, detailed, and polite answers to the human's questions.\n\n",
+    roles=("Human", "Assistant"),
+    messages=(),
+    offset=0,
+    sep_style=SeparatorStyle.ADD_EOS_TOKEN,
+    sep="</s>",
+)
+
+default_conversation = conv

applications/Chat/coati/dataset/sft_dataset.py

@@ -15,7 +15,7 @@
 import copy
 import random
 from dataclasses import dataclass, field
-from typing import Callable, Dict, Sequence
+from typing import Callable, Dict, List, Sequence, Tuple
 
 import torch
 import torch.distributed as dist
@@ -25,11 +25,21 @@ from tqdm import tqdm
 
 from colossalai.logging import get_dist_logger
 
+from .conversation import default_conversation
 from .utils import is_rank_0, jload
 
+# The following is a template prompt for a 4-round conversation.
+"""
+A chat between a curious human and an artificial intelligence assistant. The assistant gives helpful, detailed, and polite answers to the human's questions.
+
+Human: xxx</s>Assistant: xxx</s>Human: xxx</s>Assistant: xxx</s>Human: xxx</s>Assistant: xxx</s>Human: xxx</s>Assistant: xxx</s>
+"""
+# Please note that we only calculate loss on assistant's answer tokens.
+
 logger = get_dist_logger()
 
 IGNORE_INDEX = -100
+DEFAULT_EOS_TOKEN = "</s>"
 PROMPT_DICT = {
     "prompt_input":
         ("Below is an instruction that describes a task, paired with an input that provides further context. "
@@ -107,6 +117,61 @@ def preprocess(
     return dict(input_ids=input_ids, labels=labels)
 
 
+def preprocess_conversation(sources: List[List[Dict]], tokenizer: transformers.PreTrainedTokenizer,
+                            max_length: int) -> Dict:
+    """Preprocess the conversation data by tokenizing."""
+    conversations = []
+    intermediates = []
+    for source in sources:
+        header = f"{default_conversation.system}"
+        conversation, intermediate = _add_speaker_and_signal(header, source)
+        conversations.append(conversation)
+        intermediates.append(intermediate)
+
+    conversations_tokenized = _tokenize_fn(conversations, tokenizer, max_length)
+    input_ids = conversations_tokenized["input_ids"]
+    targets = copy.deepcopy(input_ids)
+
+    assert len(targets) == len(intermediates)
+    for target, inters in zip(targets, intermediates):
+        mask = torch.zeros_like(target, dtype=torch.bool)
+        for inter in inters:
+            tokenized = _tokenize_fn(inter, tokenizer, max_length)
+
+            start_idx = tokenized["input_ids"][0].size(0) - 1
+            end_idx = tokenized["input_ids"][1].size(0)
+
+            mask[start_idx:end_idx] = True
+        target[~mask] = IGNORE_INDEX
+
+    return dict(input_ids=input_ids, labels=targets)
+
+
+def _add_speaker_and_signal(header: str,
+                            source: List[Dict],
+                            get_conversation: bool = True) -> Tuple[str, List[List[str]]]:
+    END_SIGNAL = DEFAULT_EOS_TOKEN
+    conversation = header
+    intermediate = []
+    for sentence in source:
+        from_str = sentence["from"]
+        if from_str.lower() == "human":
+            from_str = default_conversation.roles[0]
+        elif from_str.lower() == "gpt":
+            from_str = default_conversation.roles[1]
+        else:
+            from_str = 'unknown'
+
+        value = from_str + ": " + sentence["value"] + END_SIGNAL
+        if sentence["from"].lower() == "gpt":
+            start = conversation + from_str + ": "
+            end = conversation + value
+            intermediate.append([start, end])
+        if get_conversation:
+            conversation += value
+    return conversation, intermediate
+
+
 class SupervisedDataset(Dataset):
     """Dataset for supervised fine-tuning."""
 
@@ -125,15 +190,27 @@ class SupervisedDataset(Dataset):
             list_data_dict = list_data_dict[:max_datasets_size]
 
         logger.info("Formatting inputs...")
-        prompt_input, prompt_no_input = PROMPT_DICT["prompt_input"], PROMPT_DICT["prompt_no_input"]
-        sources = [
-            prompt_input.format_map(example) if example.get("input", "") != "" else prompt_no_input.format_map(example)
-            for example in list_data_dict
-        ]
-        targets = [f"{example['output']}{tokenizer.eos_token}" for example in list_data_dict]
-
-        logger.info("Tokenizing inputs... This may take some time...")
-        data_dict = preprocess(sources, targets, tokenizer, max_length)
+        if "conversations" not in list_data_dict[0]:
+            prompt_input, prompt_no_input = PROMPT_DICT["prompt_input"], PROMPT_DICT["prompt_no_input"]
+            sources = [
+                prompt_input.format_map(example)
+                if example.get("input", "") != "" else prompt_no_input.format_map(example) for example in list_data_dict
+            ]
+            targets = [f"{example['output']}{tokenizer.eos_token}" for example in list_data_dict]
+
+            if is_rank_0():
+                logger.info("Tokenizing inputs... This may take some time...")
+
+            data_dict = preprocess(sources, targets, tokenizer, max_length)
+        else:
+            if is_rank_0():
+                logger.info("Tokenizing inputs... This may take some time...")
+
+            sources = [conv["conversations"] for conv in list_data_dict]
+            data_dict = preprocess_conversation(sources, tokenizer, max_length)
+
+        if is_rank_0():
+            logger.info("Tokenizing finish.")
 
         self.input_ids = data_dict["input_ids"]
         self.labels = data_dict["labels"]

applications/Chat/examples/README.md

@@ -6,6 +6,7 @@
   - [Table of Contents](#table-of-contents)
   - [Install requirements](#install-requirements)
   - [Supervised datasets collection](#supervised-datasets-collection)
+    - [Conversation dataset generation](#conversation-dataset-generation)
   - [Stage1 - Supervised instructs tuning](#stage1---supervised-instructs-tuning)
     - [Arg List](#arg-list)
   - [Stage2 - Training reward model](#stage2---training-reward-model)
@@ -45,6 +46,49 @@ The following pic shows how we collected the data.
 <img src="https://raw.githubusercontent.com/hpcaitech/public_assets/main/applications/chat/data-collect.png" width=500/>
 </p>
 
+### Conversation dataset generation
+
+In order to further improve the model's ability to handle multi-turn conversations, we need to include samples with multi-turn conversations in the dataset. However, the samples in InstructWild and Alpaca datasets currently consist of only single-turn conversations, and their dataset organization is not suitable for storing multi-turn conversations. Additionally, after converting the aforementioned datasets, we also need to include multi-turn conversation datasets like ShareGPT, and we should transform them into the training format supported by ColossalChat.
+
+A sample of conversation dataset should have the following fields:
+
+* `type` (str, optional): The type of the data sample.
+* `language` (str, optional): The language of the data sample.
+* `dataset` (str, optional): The dataset the data sample originates from.
+* `conversations` (str, compulsory): Conversation content of the data sample.
+* `id` (int, optional): The ID of the data sample.
+
+A simple example:
+```json
+{
+    "type": "instruction",
+    "language": "English",
+    "dataset": "Alpaca",
+    "conversations": [
+        {
+            "from": "human",
+            "value": "Give three tips for staying healthy."
+        },
+        {
+            "from": "gpt",
+            "value": "1.Eat a balanced diet and make sure to include plenty of fruits and vegetables. \n2. Exercise regularly to keep your body active and strong. \n3. Get enough sleep and maintain a consistent sleep schedule."
+        }
+    ],
+    "id": 1
+}
+```
+
+> **NOTE:**  Only key `conversations` is compulsary for training and other keys serve as metadata. The length of `conversations` varies.
+
+You can run the `examples/generate_conversation_dataset.py` to generate a conversation dataset supported by ColossalChat.
+
+You can use the following cmd to generate conversation dataset.
+```
+python generate_conversation_dataset.py \
+    --dataset "All"
+    --save_path "/path/to/dataset"
+```
+
 ## Stage1 - Supervised instructs tuning
 
 Stage1 is supervised instructs fine-tuning, which uses the datasets mentioned earlier to fine-tune the model.

applications/Chat/examples/generate_conversation_dataset.py

+import argparse
+import json
+
+from datasets import load_dataset
+
+
+def generate_alpaca():
+    # We can convert dataset with the same format("instruction", "input", "output") as Alpaca into a one-round conversation.
+    conversation_dataset = []
+    dataset = load_dataset("tatsu-lab/alpaca", split="train")
+
+    instructions = dataset["instruction"]
+    inputs = dataset["input"]
+    outputs = dataset["output"]
+
+    assert len(instructions) == len(inputs) == len(outputs)
+
+    for idx in range(len(instructions)):
+        human_utterance = instructions[idx] + "\n\n" + inputs[idx] if inputs[idx] else instructions[idx]
+        human = {"from": "human", "value": human_utterance}
+
+        gpt_utterance = outputs[idx]
+        gpt = {"from": "gpt", "value": gpt_utterance}
+
+        conversation = dict(type="instruction", language="English", dataset="Alpaca", conversations=[human, gpt])
+        conversation_dataset.append(conversation)
+
+    return conversation_dataset
+
+
+def generate_sharegpt():
+    # ShareGPT data requires less processing.
+    conversation_dataset = []
+    dataset = load_dataset("anon8231489123/ShareGPT_Vicuna_unfiltered",
+                           data_files="ShareGPT_V3_unfiltered_cleaned_split_no_imsorry.json",
+                           split="train")
+
+    conversations = dataset["conversations"]
+
+    for idx in range(len(conversations)):
+        for conv in conversations[idx]:
+            # We don't need markdown and text value.
+            del conv["markdown"]
+            del conv["text"]
+
+        conversation = dict(type="conversation",
+                            language="Multilingual",
+                            dataset="ShareGPT",
+                            conversations=conversations[idx])
+        conversation_dataset.append(conversation)
+
+    return conversation_dataset
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--dataset',
+                        type=str,
+                        default="All",
+                        choices=["Alpaca", "ShareGPT", "All"],
+                        help="which dataset to convert, All will combine Alpaca and ShareGPT")
+    parser.add_argument('--save_path', type=str, default="dataset.json", help="path to save the converted dataset")
+    args = parser.parse_args()
+
+    conversation_dataset = []
+
+    if args.dataset == "Alpaca":
+        conversation_dataset.extend(generate_alpaca())
+    elif args.dataset == "ShareGPT":
+        conversation_dataset.extend(generate_sharegpt())
+    else:
+        conversation_dataset.extend(generate_alpaca())
+        conversation_dataset.extend(generate_sharegpt())
+
+    for idx, sample in enumerate(conversation_dataset):
+        sample["id"] = idx + 1
+
+    with open(args.save_path, mode='w') as f:
+        json.dump(conversation_dataset, f, indent=4, default=str, ensure_ascii=False)

applications/Chat/examples/train_sft.py

@@ -74,8 +74,8 @@ def train(args):
             padding_side="right",
             use_fast=False,
         )
-        tokenizer.eos_token = '<\s>'
-        tokenizer.pad_token = tokenizer.unk_token
+        tokenizer.eos_token = '</s>'
+        tokenizer.pad_token = tokenizer.eos_token
     else:
         raise ValueError(f'Unsupported model "{args.model}"')
 
@@ -153,9 +153,7 @@ def train(args):
                                  optim,
                                  num_warmup_steps=math.ceil(max_steps * 0.03),
                                  num_training_steps=max_steps)
-    strategy_dict = strategy.prepare(
-        dict(model=model, optimizer=optim, lr_scheduler=lr_scheduler)
-    )
+    strategy_dict = strategy.prepare(dict(model=model, optimizer=optim, lr_scheduler=lr_scheduler))
     model = strategy_dict['model']
     optim = strategy_dict['optimizer']
     lr_scheduler = strategy_dict['lr_scheduler']