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feat: Add support for jinja based template rendering of the dataset #438

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feat: Add support for jinja based template rendering of the dataset #438

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902af4f
Add support for jinja template
Abhishek-TAMU Jan 15, 2025
d65f759
Merge remote-tracking branch 'upstream/main' into jinja_template
Abhishek-TAMU Jan 22, 2025
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3 changes: 3 additions & 0 deletions tests/artifacts/predefined_data_configs/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,9 @@
DATA_CONFIG_APPLY_CUSTOM_TEMPLATE_YAML = os.path.join(
PREDEFINED_DATA_CONFIGS, "apply_custom_template.yaml"
)
DATA_CONFIG_APPLY_CUSTOM_JINJA_TEMPLATE_YAML = os.path.join(
PREDEFINED_DATA_CONFIGS, "apply_custom_jinja_template.yaml"
)
DATA_CONFIG_PRETOKENIZE_JSON_DATA_YAML = os.path.join(
PREDEFINED_DATA_CONFIGS, "pretokenized_json_data.yaml"
)
Expand Down
14 changes: 14 additions & 0 deletions tests/artifacts/predefined_data_configs/apply_custom_jinja_template.yaml
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Original file line number Diff line number Diff line change
@@ -0,0 +1,14 @@
dataprocessor:
type: default
datasets:
- name: apply_custom_data_jinja_template
data_paths:
- "FILE_PATH"
data_handlers:
- name: apply_custom_data_formatting_jinja_template
arguments:
remove_columns: all
batched: false
fn_kwargs:
dataset_text_field: "dataset_text_field"
template: "dataset_template"
47 changes: 47 additions & 0 deletions tests/data/test_data_handlers.py
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Expand Up @@ -16,6 +16,7 @@
# https://spdx.dev/learn/handling-license-info/

# Third Party
from jinja2.exceptions import TemplateSyntaxError
from transformers import AutoTokenizer
import datasets
import pytest
Expand All @@ -25,6 +26,7 @@

# Local
from tuning.data.data_handlers import (
apply_custom_data_formatting_jinja_template,
apply_custom_data_formatting_template,
combine_sequence,
)
Expand Down Expand Up @@ -57,6 +59,32 @@ def test_apply_custom_formatting_template():
assert formatted_dataset["train"][0][formatted_dataset_field] == expected_response


def test_apply_custom_formatting_jinja_template():
json_dataset = datasets.load_dataset(
"json", data_files=TWITTER_COMPLAINTS_DATA_JSONL
)
template = "### Input: {{Tweet text}} \n\n ### Response: {{text_label}}"
tokenizer = AutoTokenizer.from_pretrained(MODEL_NAME)
formatted_dataset_field = "formatted_data_field"
formatted_dataset = json_dataset.map(
apply_custom_data_formatting_jinja_template,
fn_kwargs={
"tokenizer": tokenizer,
"dataset_text_field": formatted_dataset_field,
"template": template,
},
)
# First response from the data file that is read.
expected_response = (
"### Input: @HMRCcustomers No this is my first job"
+ " \n\n ### Response: no complaint"
+ tokenizer.eos_token
)

assert formatted_dataset_field in formatted_dataset["train"][0]
assert formatted_dataset["train"][0][formatted_dataset_field] == expected_response


def test_apply_custom_formatting_template_gives_error_with_wrong_keys():
"""Tests that the formatting function will throw error if wrong keys are passed to template"""
json_dataset = datasets.load_dataset(
Expand All @@ -76,6 +104,25 @@ def test_apply_custom_formatting_template_gives_error_with_wrong_keys():
)


def test_apply_custom_formatting_jinja_template_gives_error_with_wrong_keys():
"""Tests that the jinja formatting function will throw error if wrong keys are passed to template"""
json_dataset = datasets.load_dataset(
"json", data_files=TWITTER_COMPLAINTS_DATA_JSONL
)
template = "### Input: {{not found}} \n\n ### Response: {{text_label}}"
formatted_dataset_field = "formatted_data_field"
tokenizer = AutoTokenizer.from_pretrained(MODEL_NAME)
with pytest.raises((KeyError, TemplateSyntaxError)):
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can we catch this error inside our code and give users a simple text error?

json_dataset.map(
apply_custom_data_formatting_jinja_template,
fn_kwargs={
"tokenizer": tokenizer,
"dataset_text_field": formatted_dataset_field,
"template": template,
},
)


@pytest.mark.parametrize(
"input_element,output_element,expected_res",
[
Expand Down
15 changes: 13 additions & 2 deletions tests/data/test_data_preprocessing_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,7 @@

# First Party
from tests.artifacts.predefined_data_configs import (
DATA_CONFIG_APPLY_CUSTOM_JINJA_TEMPLATE_YAML,
DATA_CONFIG_APPLY_CUSTOM_TEMPLATE_YAML,
DATA_CONFIG_MULTIPLE_DATASETS_SAMPLING_YAML,
DATA_CONFIG_PRETOKENIZE_JSON_DATA_YAML,
Expand Down Expand Up @@ -693,6 +694,10 @@ def test_process_data_args_throws_error_where_needed(data_args, packing):
(DATA_CONFIG_APPLY_CUSTOM_TEMPLATE_YAML, TWITTER_COMPLAINTS_DATA_JSONL),
(DATA_CONFIG_APPLY_CUSTOM_TEMPLATE_YAML, TWITTER_COMPLAINTS_DATA_PARQUET),
(DATA_CONFIG_APPLY_CUSTOM_TEMPLATE_YAML, TWITTER_COMPLAINTS_DATA_ARROW),
(DATA_CONFIG_APPLY_CUSTOM_JINJA_TEMPLATE_YAML, TWITTER_COMPLAINTS_DATA_JSON),
(DATA_CONFIG_APPLY_CUSTOM_JINJA_TEMPLATE_YAML, TWITTER_COMPLAINTS_DATA_JSONL),
(DATA_CONFIG_APPLY_CUSTOM_JINJA_TEMPLATE_YAML, TWITTER_COMPLAINTS_DATA_PARQUET),
(DATA_CONFIG_APPLY_CUSTOM_JINJA_TEMPLATE_YAML, TWITTER_COMPLAINTS_DATA_ARROW),
(DATA_CONFIG_PRETOKENIZE_JSON_DATA_YAML, TWITTER_COMPLAINTS_TOKENIZED_JSON),
(DATA_CONFIG_PRETOKENIZE_JSON_DATA_YAML, TWITTER_COMPLAINTS_TOKENIZED_JSONL),
(DATA_CONFIG_PRETOKENIZE_JSON_DATA_YAML, TWITTER_COMPLAINTS_TOKENIZED_PARQUET),
Expand Down Expand Up @@ -731,7 +736,10 @@ def test_process_dataconfig_file(data_config_path, data_path):

# Modify dataset_text_field and template according to dataset
formatted_dataset_field = "formatted_data_field"
if datasets_name == "apply_custom_data_template":
if datasets_name in (
"apply_custom_data_template",
"apply_custom_data_jinja_template",
):
template = "### Input: {{Tweet text}} \n\n ### Response: {{text_label}}"
yaml_content["datasets"][0]["data_handlers"][0]["arguments"]["fn_kwargs"] = {
"dataset_text_field": formatted_dataset_field,
Expand All @@ -753,7 +761,10 @@ def test_process_dataconfig_file(data_config_path, data_path):
assert set(train_set.column_names) == column_names
elif datasets_name == "pretokenized_dataset":
assert set(["input_ids", "labels"]).issubset(set(train_set.column_names))
elif datasets_name == "apply_custom_data_template":
elif datasets_name in (
"apply_custom_data_template",
"apply_custom_data_jinja_template",
):
assert formatted_dataset_field in set(train_set.column_names)


Expand Down
61 changes: 61 additions & 0 deletions tuning/data/data_handlers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,7 @@
import re

# Third Party
from jinja2 import Environment, StrictUndefined
from transformers import AutoTokenizer


Expand Down Expand Up @@ -137,6 +138,65 @@ def replace_text(match_obj):
}


def apply_custom_data_formatting_jinja_template(
element: Dict[str, str],
tokenizer: AutoTokenizer,
dataset_text_field: str,
template: str,
**kwargs,
):
"""Function to format datasets with jinja templates.
Expects to be run as a HF Map API function.
Args:
element: the HF Dataset element loaded from a JSON or DatasetDict object.
dataset_text_field: formatted_dataset_field.
template: Template to format data with. Features of Dataset
should be referred to by {{key}}.
Returns:
Formatted HF Dataset
"""

template = transform_placeholders(template)
env = Environment(undefined=StrictUndefined)
jinja_template = env.from_string(template)

try:
rendered_text = jinja_template.render(element=element, **element)
except Exception as e:
raise KeyError(f"Dataset does not contain field in template. {e}") from e

rendered_text += tokenizer.eos_token
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@ashokponkumar Wanted to just confirm the removal of eos_token from dataset samples in this handler. In other handlers we add eos_token and don't expect users to add it. Hence in this handler where user passes Jinja template are we expecting user to pass eos_token too? I guess in case of non-pretokenized dataset not using eos_token when using DataCollatorForCompletionOnlyLM might affect F1 score on tuned models ?

2- @dushyantbehl Can I ask how Jinja templating could be used with pre-tokenized dataset (Having input_ids and labels as columns) ?

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  1. I think we need a proper documentation for now and a patch where we let users choose if they want an eos_token with the data handlers or not via one argument e.g. add a kwarg to the data handlers like add_eos_token this way we can let them choose what they want inside a data config.
    for a data config we should not assume things like what should we do while users want to do.
    for our data args we can have this added inside our code at the last data handler whatever we choose so that our data args usecases remain same.

if you feel can you take this up with this patch? to add the kwarg for eos_token to clean up the interface with users? else we can park this to a next patch.

  1. For pre tokenised datasets we can ignore the jinja template imo this should be applied only to non tokeniser data sets .
    We can add all these things to documentation and I request you to please add documentation with this patch.


return {dataset_text_field: rendered_text}


def transform_placeholders(template: str) -> str:
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@dushyantbehl @ashokponkumar Are we handling nested dataset use case also, as I see every other handler expects dataset element Dict[str, str] and not Dict[str, Dict] ?

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I think we were only handling non nested datasets apart from chat templates...can we test things out with this patch if our code works for nested datasets then can we have a change of the argument type here?

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@dushyantbehl dushyantbehl Jan 28, 2025 •
edited
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Also if you can move to utils as we discussed in our last call. Thanks.

"""
Function to detect all placeholders of the form {{...}}.
- If the inside has a space (e.g. {{Tweet text}}),
rewrite to {{ element['Tweet text'] }}.
- If it doesn't have a space (e.g. {{text_label}}), leave it as is.
- If it is already using dictionary-style access ({{ element['xyz'] }}), do nothing.
"""

pattern = r"\{\{([^}]+)\}\}"
matches = re.findall(pattern, template)

for match in matches:
original_placeholder = f"{{{{{match}}}}}"
trimmed = match.strip()

if trimmed.startswith("element["):
continue

# If there's a space in the placeholder name, rewrite it to dictionary-style
if " " in trimmed:
new_placeholder = f"{{{{ element['{trimmed}'] }}}}"
template = template.replace(original_placeholder, new_placeholder)

return template


def apply_tokenizer_chat_template(
element: Dict[str, str],
tokenizer: AutoTokenizer,
Expand All @@ -157,5 +217,6 @@ def apply_tokenizer_chat_template(
"tokenize_and_apply_input_masking": tokenize_and_apply_input_masking,
"apply_dataset_formatting": apply_dataset_formatting,
"apply_custom_data_formatting_template": apply_custom_data_formatting_template,
"apply_custom_data_formatting_jinja_template": apply_custom_data_formatting_jinja_template,
"apply_tokenizer_chat_template": apply_tokenizer_chat_template,
}
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