Feat: Add support for tokenizer’s or custom jinja chat_template (#1970)

* Allow using tokenizer's default chat template with fallbacks Summary of changes: 1. Adds `tokenizer_default` as option for `chat_template` in `chat_template` prompt strategy that allows using the chat template from tokenizer's config.json 2. Allows falling back to chat templates available in axolotl if tokenizer does not have a chat template 3. Adds a mistral chat template which supports system message - taken from https://github.com/chujiezheng/chat_templates/blob/main/chat_templates/mistral-instruct.jinja --- Why? Many popular models are not trained with chatml format. As a result for the model to correctly learn chatml we have to turn on train_on_inputs which requires more compute and time. If we can use the model's already learned chat template we can just learn the output tokens --- Todo: - Write tests * Add tests * Fix lint and bug post merge from main * Add option `chat_template_jinja` to provide a jinja template * remove custom mistral template * Address review comments and add docs * Update docs/dataset-formats/conversation.qmd Co-authored-by: NanoCode012 <[email protected]> * fix: set default to tokenizer template * Merge branch 'main' into cj_tokenizer_default_prompt_template * chore: remove redundant function * fix: re-arrange enum declaration position * fix: refactor artifact left from main merge * feat(doc): updated config with chat template options and clarified examples * chore: clarify doc * chore: added example for non-default template * chore: refactor * fix: test * fix: config being dropped and unittest to catch that * chore: lint * chore: skip duplicate * fix: rename var after merge * feat: add test for levy's dpo case * fix: remove default setting on edge case where chat template overriden in dataset section * feat: handle sharegpt deprecation better in docs * feat: add example using fallback * feat: handles chat_template requiring specific user/assistant order * fix: update test based on new defaults * fix: imported name incorrectly updated on merge * chore: lint * fix: update dummy message to prevent potential overlap with real content * fix(doc): formatting * fix: update bradleyterry to use new chat_template --------- Co-authored-by: Chirag Jain <[email protected]>
axolotl-ai-cloud · Oct 29, 2024 · bfc77b0 · bfc77b0
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diff --git a/README.md b/README.md
@@ -383,7 +383,7 @@ See [examples](examples) for quick start. It is recommended to duplicate and mod
         - typescript
       type: ... # unimplemented custom format
 
-      # fastchat conversation (deprecation soon, use chat_template)
+      # fastchat conversation (deprecation soon, use chat_template https://axolotl-ai-cloud.github.io/axolotl/docs/dataset-formats/conversation.html#chat_template)
       # See 'conversation' options: https://github.com/lm-sys/FastChat/blob/main/fastchat/conversation.py
     - path: ...
       type: sharegpt

diff --git a/docs/config.qmd b/docs/config.qmd
@@ -83,7 +83,7 @@ lora_on_cpu: true
 datasets:
   # HuggingFace dataset repo | s3://,gs:// path | "json" for local dataset, make sure to fill data_files
   - path: vicgalle/alpaca-gpt4
-  # The type of prompt to use for training. [alpaca, sharegpt, gpteacher, oasst, reflection]
+    # The type of prompt to use for training. [alpaca, sharegpt, gpteacher, oasst, reflection]
     type: alpaca # format | format:<prompt_style> (chat/instruct) | <prompt_strategies>.load_<load_fn>
     ds_type: # Optional[str] (json|arrow|parquet|text|csv) defines the datatype when path is a file
     data_files: # Optional[str] path to source data files
@@ -124,6 +124,48 @@ datasets:
       # For `completion` datsets only, uses the provided field instead of `text` column
       field:
 
+  # Using chat template
+  - path: ...
+    # Set type to `chat_template` to use this strategy
+    type: chat_template
+    # Specify the name of the chat template to use
+    # The name of the chat template to use for training, following values are supported:
+    # - tokenizer_default: Uses the chat template that is available in the tokenizer_config.json. If the chat template is not available in the tokenizer, it will raise an error. This is the default.
+    # - alpaca/inst/chatml/gemma/cohere/llama3/phi_3/deepseek_v2/jamba: These chat templates are available in the axolotl codebase at src/axolotl/utils/chat_templates.py
+    # - tokenizer_default_fallback_*: where * is the name of the chat template to fallback to if the tokenizer does not have a chat template else default to tokenizer. E.g. tokenizer_default_fallback_chatml.
+    # - jinja: Uses a custom jinja template for the chat template. The custom jinja template should be provided in the chat_template_jinja field.
+    chat_template: tokenizer_default
+    # Custom jinja template for chat template. This will be only used if `chat_template` is set to `jinja` or empty (in which case chat_template is automatically set to `jinja`).
+    chat_template_jinja:
+    # The key in the data example that contains the messages. Default is "messages".
+    field_messages: messages
+    # The key in the message turn that contains the role. Default is "role".
+    message_field_role: role
+    # The key in the message turn that contains the content. Default is "content".
+    message_field_content: content
+    # Optional[Dict[str, List]]. Roles mapping for the messages.
+    roles:
+      user: ["human", "user"]
+      assistant: ["gpt", "assistant", "ai"]
+      system: ["system"]
+
+    ## NOTE: Leaving the below empty will default to using the simple legacy tokenization strategy where only last message is trained on.
+
+    # Optional[List[str]]. Roles to train on. The tokens from these roles will be considered for the loss.
+    roles_to_train: ["gpt", "assistant"]
+    # Optional[str]. Which EOS tokens to train on in the conversation. Possible values are:
+    # - all: train on all EOS tokens
+    # - turn: train on the EOS token at the end of each trainable turn
+    # - last: train on the last EOS token in the conversation
+    train_on_eos: last
+    # The key in the message turn that indicates via boolean whether tokens of a turn should be considered for training. Useful to selectively train on certain turns besides the `roles_to_train`.
+    message_field_training: training
+    # The key in the message turn that contains the training details. Useful to selectively train on certain tokens in a turn.
+    # The value of the key is a List[Dict] containing `begin_offset` (start character index in content), `end_offset` (end character index in content), and `train` (boolean whether to train).
+    # See example at `docs/dataset-formats/conversation.qmd`
+    message_field_training_detail: train_detail
+
+
 # If false, the datasets will not be shuffled and will keep their original order in `datasets`.
 # The same applies to the `test_datasets` option and the `pretraining_dataset` option. Default is true.
 shuffle_merged_datasets: true
@@ -142,9 +184,16 @@ test_datasets:
 # use RL training: 'dpo', 'ipo', 'kto'
 rl:
 
-# Saves the desired chat template to the tokenizer_config.json for easier inferencing
-# Currently supports chatml and inst (mistral/mixtral)
-chat_template: chatml
+# The name of the chat template to use for training, following values are supported:
+# - tokenizer_default: Uses the chat template that is available in the tokenizer_config.json. If the chat template is not available in the tokenizer, it will raise an error. This is the default value.
+# - alpaca/inst/chatml/gemma/cohere/llama3/phi_3/deepseek_v2/jamba: These chat templates are available in the axolotl codebase at src/axolotl/utils/chat_templates.py
+# - tokenizer_default_fallback_*: where * is the name of the chat template to fallback to. E.g. tokenizer_default_fallback_chatml. This is useful when the chat template is not available in the tokenizer.
+# - jinja: Uses a custom jinja template for the chat template. The custom jinja template should be provided in the chat_template_jinja field.
+# The selected chat template will be saved to the tokenizer_config.json for easier inferencing
+# Note: It is recommended to set train_on_inputs to true when using a chat template that is different from the model's default chat template.
+chat_template: tokenizer_default
+# custom jinja template for chat template. This will be only used if chat_template is set to `jinja` or `null` (in which case chat_template is automatically set to `jinja`). Default is null.
+chat_template_jinja: null
 # Changes the default system message
 default_system_message: You are a helpful assistant. Please give a long and detailed answer. # Currently only supports chatml.
 # Axolotl attempts to save the dataset as an arrow after packing the data together so

diff --git a/docs/dataset-formats/conversation.qmd b/docs/dataset-formats/conversation.qmd
@@ -6,6 +6,8 @@ order: 3
 
 ## sharegpt
 
+UPDATE: ShareGPT is being deprecated in the next release. Please see `chat_template` section below.
+
 conversations where `from` is `human`/`gpt`. (optional: first row with role `system` to override default system prompt)
 
 ```{.json filename="data.jsonl"}
@@ -69,3 +71,138 @@ creates a chat where bot is asked to tell a joke, then explain why the joke is f
 ```{.json filename="data.jsonl"}
 {"conversations": [{"title": "...", "text": "...", "explanation": "..."}]}
 ```
+
+
+## chat_template
+
+Chat Template strategy uses a jinja2 template that converts a list of messages into a prompt. Support using tokenizer's template, a supported template, or custom jinja2.
+
+```{.json filename="data.jsonl"}
+{"conversations": [{"role": "...", "content": "..."}]}
+```
+
+See `config.qmd` for full configs and supported templates.
+
+### Migrating from sharegpt
+
+Most configs can be adapted as follows:
+
+```yaml
+# old
+chat_template: chatml
+datasets:
+  - path: ...
+    type: sharegpt
+    conversation: chatml
+
+# new (if using tokenizer's chat_template)
+datasets:
+  - path: ...
+    type: chat_template
+
+    field_messages: conversations
+    message_field_role: from
+    message_field_content: value
+
+# new (if setting a new chat_template like chatml, gemma, etc)
+chat_template: chatml
+datasets:
+  - path: ...
+    type: chat_template
+
+    field_messages: conversations
+    message_field_role: from
+    message_field_content: value
+```
+
+We recommend checking the below examples for other usecases.
+
+### Examples
+
+1. Using the default chat template in the tokenizer_config.json on OpenAI messages format, training on only last message.
+
+```yaml
+datasets:
+  - path: ...
+    type: chat_template
+```
+
+2. Using the `gemma` chat template to override the tokenizer_config.json's chat template on OpenAI messages format, training on all assistant messages.
+
+```yaml
+chat_template: gemma # this overwrites the tokenizer's chat_template
+datasets:
+  - path: ...
+    type: chat_template
+    roles_to_train: ["assistant"]
+```
+
+3. Using the tokenizer_config.json's chat template or `chatml` as fallback if the former's chat template does not exist, on OpenAI messages format, training on all assistant messages.
+
+```yaml
+chat_template: tokenizer_default_fallback_chatml # this overwrites the tokenizer's chat_template
+datasets:
+  - path: ...
+    type: chat_template
+    roles_to_train: ["assistant"]
+```
+
+4. Using a custom jinja template on OpenAI messages format, training on all assistant messages.
+
+```yaml
+# chat_template: jinja # `jinja` will be implied if the `chat_template_jinja` is set and this field is empty
+chat_template_jinja: "{{ bos_token }}{% for message in messages %}{% if (message['role'] == 'system') %}{{'<|system|>' + '\n' + message['content'] + '<|end|>' + '\n'}}{% elif (message['role'] == 'user') %}{{'<|user|>' + '\n' + message['content'] + '<|end|>' + '\n' + '<|assistant|>' + '\n'}}{% elif message['role'] == 'assistant' %}{{message['content'] + '<|end|>' + '\n'}}{% endif %}{% endfor %}"
+
+datasets:
+  - path: ...
+    type: chat_template
+    roles_to_train: ["assistant"]
+```
+
+5. (Advanced) Using fine-grained control over tokens and turns to train in a conversation
+
+For a data sample that looks like:
+
+```{.json filename="data.jsonl"}
+{
+  "conversations": [
+    {"from": "system", "value": "You are an AI assistant.", "train": false},
+    {"from": "human", "value": "Hello", "train": false},
+    {"from": "assistant", "value": "Hello", "train": true},
+    {"from": "human", "value": "How are you?", "train": true},
+    {
+      "from": "assistant",
+      "value": "I'm doing very well, thank you!",
+      "train_detail": [
+        {"begin_offset": 0, "end_offset": 8, "train": false},
+        {"begin_offset": 9, "end_offset": 18, "train": true},
+        {"begin_offset": 19, "end_offset": 30, "train": false},
+      ],
+    },
+    {
+        "from": "human",
+        "value": "I'm doing very well, thank you!",
+        "train": true,
+    },
+    {"from": "assistant", "value": "Hi there!", "train": true}
+  ]
+}
+```
+
+The configuration would look like:
+
+```yaml
+datasets:
+  - path: ...
+    type: chat_template
+    chat_template: tokenizer_default
+    field_messages: conversations
+    message_field_role: from
+    message_field_content: value
+    roles_to_train: []
+    train_on_eos: turn
+    message_field_training: train
+    message_field_training_detail: train_detail
+```
+
+Tip: It is not necessary to use both `message_field_training` and `message_field_training_detail` at a time.
diff --git a/src/axolotl/cli/__init__.py b/src/axolotl/cli/__init__.py
@@ -30,7 +30,7 @@
 from axolotl.integrations.base import PluginManager
 from axolotl.logging_config import configure_logging
 from axolotl.train import TrainDatasetMeta
-from axolotl.utils.chat_templates import chat_templates
+from axolotl.utils.chat_templates import get_chat_template
 from axolotl.utils.comet_ import setup_comet_env_vars
 from axolotl.utils.config import (
     normalize_cfg_datasets,
@@ -272,7 +272,7 @@ def do_inference_gradio(
             importlib.import_module("axolotl.prompters"), prompter
         )
     elif cfg.chat_template:
-        chat_template_str = chat_templates(cfg.chat_template)
+        chat_template_str = get_chat_template(cfg.chat_template)
 
     model = model.to(cfg.device, dtype=cfg.torch_dtype)
 

diff --git a/src/axolotl/core/trainer_builder.py b/src/axolotl/core/trainer_builder.py
@@ -63,7 +63,7 @@
     log_prediction_callback_factory,
 )
 from axolotl.utils.callbacks.lisa import lisa_callback_factory
-from axolotl.utils.chat_templates import chat_templates
+from axolotl.utils.chat_templates import get_chat_template
 from axolotl.utils.collators import (
     BatchSamplerDataCollatorForSeq2Seq,
     DataCollatorForSeq2Seq,
@@ -1594,7 +1594,7 @@ def build(self, total_num_steps):
         training_arguments_kwargs["model_type"] = self.cfg.model_config_type
         training_arguments_kwargs["pretraining"] = bool(self.cfg.pretraining_dataset)
         if self.cfg.chat_template:
-            training_arguments_kwargs["chat_template"] = chat_templates(
+            training_arguments_kwargs["chat_template"] = get_chat_template(
                 self.cfg.chat_template
             )
 

diff --git a/src/axolotl/prompt_strategies/bradley_terry/__init__.py b/src/axolotl/prompt_strategies/bradley_terry/__init__.py
@@ -6,7 +6,7 @@
 
 from axolotl.prompt_strategies.user_defined import UserDefinedDatasetConfig
 
-LOG = logging.getLogger("axolotl.prompt_strategies")
+LOG = logging.getLogger("axolotl.prompt_strategies.bradley_terry")
 
 
 def load(strategy, tokenizer, cfg, ds_cfg):

diff --git a/src/axolotl/prompt_strategies/bradley_terry/chat_template.py b/src/axolotl/prompt_strategies/bradley_terry/chat_template.py
@@ -2,13 +2,18 @@
 Bradley-Terry model with chat template prompt strategy.
 """
 
+import logging
 from typing import Any, Dict, Optional
 
 from axolotl.prompt_strategies.chat_template import (
     ChatTemplatePrompter,
     ChatTemplateStrategy,
 )
-from axolotl.utils.chat_templates import chat_templates
+from axolotl.utils.chat_templates import get_chat_template_from_config
+
+# Configure the logger
+LOG = logging.getLogger("axolotl.prompt_strategies.bradley_terry.chat_template")
+LOG.setLevel(logging.INFO)
 
 
 class BTChatTemplateStrategy(ChatTemplateStrategy):
@@ -27,18 +32,24 @@ def tokenize_prompt(self, prompt):
         # pylint: disable=duplicate-code
         prompt[self.messages] = []
         if prompt["system"]:
-            prompt[self.messages].append({"from": "system", "value": prompt["system"]})
-        prompt[self.messages].append({"from": "user", "value": prompt["input"]})
-        prompt[self.messages].append({"from": "assistant", "value": prompt["chosen"]})
+            prompt[self.messages].append(
+                {"role": "system", "content": prompt["system"]}
+            )
+        prompt[self.messages].append({"role": "user", "content": prompt["input"]})
+        prompt[self.messages].append({"role": "assistant", "content": prompt["chosen"]})
         chosen_tokenized = super().tokenize_prompt(prompt)
 
         self.messages = "rejected_messages"
         # pylint: disable=duplicate-code
         prompt[self.messages] = []
         if prompt["system"]:
-            prompt[self.messages].append({"from": "system", "value": prompt["system"]})
-        prompt[self.messages].append({"from": "user", "value": prompt["input"]})
-        prompt[self.messages].append({"from": "assistant", "value": prompt["rejected"]})
+            prompt[self.messages].append(
+                {"role": "system", "content": prompt["system"]}
+            )
+        prompt[self.messages].append({"role": "user", "content": prompt["input"]})
+        prompt[self.messages].append(
+            {"role": "assistant", "content": prompt["rejected"]}
+        )
         rejected_tokenized = super().tokenize_prompt(prompt)
 
         return {
@@ -53,15 +64,18 @@ def tokenize_prompt(self, prompt):
 
 def load(tokenizer, cfg, ds_cfg: Optional[Dict[str, Any]] = None):
     ds_cfg = ds_cfg or {}
+    chat_template_string = get_chat_template_from_config(
+        cfg=cfg, ds_cfg=ds_cfg, tokenizer=tokenizer
+    )
 
     prompter_params = {
         "tokenizer": tokenizer,
-        "chat_template": chat_templates(ds_cfg.get("chat_template", "chatml")),
-        "message_field_role": ds_cfg.get("message_field_role", "from"),
-        "message_field_content": ds_cfg.get("message_field_content", "value"),
-        "message_field_training": ds_cfg.get("message_field_training", "training"),
+        "chat_template": chat_template_string,
+        "message_field_role": ds_cfg.get("message_field_role", "role"),
+        "message_field_content": ds_cfg.get("message_field_content", "content"),
+        "message_field_training": ds_cfg.get("message_field_training", None),
         "message_field_training_detail": ds_cfg.get(
-            "message_field_training_detail", "train_detail"
+            "message_field_training_detail", None
         ),
         "roles": ds_cfg.get("roles"),
         "drop_system_message": ds_cfg.get("drop_system_message", False),
@@ -74,8 +88,8 @@ def load(tokenizer, cfg, ds_cfg: Optional[Dict[str, Any]] = None):
     strategy_params = {
         "train_on_inputs": cfg.train_on_inputs,
         "sequence_len": cfg.sequence_len,
-        "roles_to_train": ds_cfg.get("roles_to_train", ["gpt", "assistant"]),
-        "train_on_eos": ds_cfg.get("train_on_eos", "turn"),
+        "roles_to_train": ds_cfg.get("roles_to_train", []),
+        "train_on_eos": ds_cfg.get("train_on_eos", None),
     }
 
     strategy = BTChatTemplateStrategy(

diff --git a/src/axolotl/prompt_strategies/chat_template.py b/src/axolotl/prompt_strategies/chat_template.py
@@ -9,7 +9,7 @@
 
 from axolotl.prompt_tokenizers import PromptTokenizingStrategy
 from axolotl.prompters import IGNORE_TOKEN_ID, Prompter
-from axolotl.utils.chat_templates import chat_templates
+from axolotl.utils.chat_templates import get_chat_template_from_config
 
 # Configure the logger
 LOG = logging.getLogger("axolotl")
@@ -405,10 +405,14 @@ def get_images(self, prompt):
 def load(tokenizer, cfg, ds_cfg: Optional[Dict[str, Any]] = None, processor=None):
     # pylint: disable=duplicate-code
     ds_cfg = ds_cfg or {}
+    chat_template_string = get_chat_template_from_config(
+        cfg=cfg, ds_cfg=ds_cfg, tokenizer=tokenizer
+    )
+    LOG.info(f"Using chat template:\n---\n{chat_template_string!s}\n---")
 
     prompter_params = {
         "tokenizer": tokenizer,
-        "chat_template": chat_templates(ds_cfg.get("chat_template", "chatml")),
+        "chat_template": chat_template_string,
         "message_field_role": ds_cfg.get("message_field_role", "role"),
         "message_field_content": ds_cfg.get("message_field_content", "content"),
         "message_field_training": ds_cfg.get("message_field_training", None),