Strata is an open-source, low-code library designed to streamline the fine-tuning, evaluation, and deployment of large language models (LLMs) for extracting structured data from free-text clinical reports. It enables researchers to easily customize LLMs for clinical information extraction, reducing the need for extensive manual annotation. Strata supports local model hosting, ensuring privacy, reproducibility, and control over model versions. By simplifying the customization process and requiring minimal computational resources, Strata accelerates the development of AI tools for clinical research, making it more accessible to users with limited technical expertise. Strata leverages the Hugging Face Transformers library and unsloth library for implementations of LLMs and efficient fine-tuning.
Please ensure your docker has GPU support (Docker installation guide). We recommend using rootless docker for security.
docker build --build-arg http_proxy="${http_proxy}" --build-arg https_proxy="${https_proxy}" --build-arg no_proxy="${no_proxy}" -t strata:0.1 .
docker run -it --rm -e http_proxy="${http_proxy}" -e https_proxy="${https_proxy}" -e no_proxy="${no_proxy}" -v .:/root/strata --gpus all strata:0.1
# Then you can run train/inference commandsIf you want to use docker for development, it is advised to mount a clone of this repo into the docker so that updates outside can be reflected inside of the docker container (through -v .:/root/strata added above).
You need to install Miniconda first and then run the command.
# Ensure you are in the clone of this repo
source ./setup_conda.sh
# Every time you log in, please switch to strata env
conda activate strata
# Then you can run train/inference commandsInstall the package as an editable package and install pre-commit to develop.
pip install -e . -v
pip install pre-commit
# Initialize pre-commit
pre-commit installTo use this library, please preprocess your data into CSV format and include only the following columns: "Accession Number", "Report Text", and ground truth values (inference will run without ground truth labels, but they are required for training and evaluation).
You can reference synthetic example data at train_0.8_0.1_0.1_0.csv. In addition to the accession numbers and report texts, we have ground truth labels for two tasks: tissue source and cancer diagnosis. The tissue source can be any combination of left breast and right breast. In the columns Source_LB and Source_RB, the value is 1 if the tissue is examined and 0 if it is absent. In the columns Source_LB and Source_RB, the value is 1 if a tissue source is examined and cancer is deterministically diagnosed and 0 otherwise.
The following script may be used to split data into training, validation, and test sets: split_data.py.
In the dataset above, we care about two tasks: the tissue source and the cancer diagnosis associated with each report text. Each task should be defined by i) a question to the model, ii) the corresponding ground truth labels, which can be in any number of columns, and iii) parse functions, which convert the ground truth labels to the intended LLM response and vice versa. The template file should be formatted as follows:
name # each question should have a unique identifier
question: # the text of the question itself
gt_columns: # the column names
parse_response: # the path to the parse function
question_name: # question name used for formatting
response_start: # optional, defaults to "My answer is:"
preamble: # optional, defaults to "You are an experienced pathologist. Answer the question using the pathology report below. Base the answer on the report only. Do not add any additional information."Each row in the data will be mapped into a prompt framework which consists of two roles, a user and an assistant. The question field and the value of "Report Text" will be inserted into the prompt framework as part of what the user says:
{preamble}
{report}
{question}
The assistant responds to the user’s question. This always begins with the response_start. During fine-tuning, the response includes the ground truth. During inference, the model is prompted to complete the response with label it predicts.
An example template is provided in this repo. You can download it and modify for your application.
The parse_response file should contain two methods: the template, gt_to_response, and the parsing script, parse_response. During training, the output of the template is added to the assistant's response after response_start. During inference, the generated prediction is passed into the parsing script. You can reference an example here: parse_functions/example/cancer.py.
In the example, the template gt_to_response({"Source_RB": 1, "Source_LB": 0}) will output "right breast".
def gt_to_response(gt):
"""
Args:
gt (dict): a dictionary with (gt column, gt value) pairs from one row in the data
Returns:
str: the intended response for the LLM
"""In the example, the parsing script parse_response("My answer is: right breast", "My answer is:") will output {"Source_RB": 1, "Source_LB": 0}.
def parse_response(response, response_start):
"""
Args:
response (str): the raw LLM response in its entirety
response_start (str): the prefix to the response, to be removed from response
Outputs
dict: a dictionary with (gt column, gt value) pairs from one row in the data
"""Unsloth library supports fine-tuning numerous LLMs, which we also support. We have tested the codebase on the following models:
An example config shows how to set the data paths, the model architecture, and the training and inference settings.
In test mode, the library predicts the labels and evaluates the predictions against ground truth values at args.data.val_set_data_path, logging the overall accuracy and the question accuracies. args.save_path defaults to outputs/ and args.exp_name defaults to example/llama3.1-8b, so the outputs will be saved at outputs/example/llama3.1-8b.
python -m strata.main test configs/example/llama3.1-8b.yaml --inference-mode zero-shot Four files will be saved at outputs/example/llama3.1-8b: inference.csv contains the predicted responses of the model, eval.csv contains the comparisons with the ground truth labels, and scores.csv and scores_per_column.csv contain the evaluation metrics per question and per column respectively.
If the ground truth labels are not known, inference mode should be used. The library will only generate the predictions for the report texts at args.data.val_set_data_path.
python -m strata.main inference configs/example/llama3.1-8b.yaml --inference-mode zero-shot Please check the inference.csv for inference outputs at outputs/example/llama3.1-8b.
To fine-tune the model on the dataset at args.data.train_set_data_path, run the following command. You will be prompted to log-in to WandB, which will track the training loss. The model checkpoint will be saved at outputs/example/llama3.1-8b-ft.
python -m strata.main train configs/example/llama3.1-8b.yaml --opts exp_name example/llama3.1-8b-ftQuestions to be included in finetuning can be selected in args.data.questions.
Using the same config, the library will load the finetuned model checkpoint and evaluate the accuracy on args.data.val_set_data_path.
python -m strata.main test configs/example/llama3.1-8b.yaml --inference-mode fine-tuned --opts exp_name example/llama3.1-8b-ftAs in zero-shot, four files will be saved at outputs/example/llama3.1-8b-ft: inference.csv contains the predicted responses of the model, eval.csv contains the comparisons with the ground truth labels, and scores.csv and scores_per_column.csv contain the evaluation metrics per question and per column respectively.
You can loop through hyperparameters using a bash loop. Here is an example that sweeps through the learning rate:
for lr in 0.001 0.0001 0.00001
do
python -m strata.main train configs/example/llama3.1-8b.yaml --opts trainer.learning_rate $lr exp_name example/llama3.1-8b-ft-lr$lr
doneSet use_test_set in the config to True. The library will generate the predictions for the report texts at args.data.test_set_data_path, and the saved csvs will have suffix _test_set.
By default Strata will calculate the exact match, F1, precision, and recall scores. The function should be defined according to the following docstring:
def metric(gt_column, pred_column, inference_results_df):
"""
Args:
gt_column (str): the column containing the ground truth labels
pred_column (str): the column containing the predicted labels
inference_results_df (pandas.DataFrame): the DataFrame at inference.csv, which contains the predicted labels and the ground truth labels
Outputs
float: the value of the metric for gt_column and pred_column
"""Here is an example of a function that calculates mean squared error:
from sklearn.metrics import mean_squared_error
def MSE(gt_column, pred_column, inference_results_df):
# Identify rows with ground truth labels
keep_if_labeled = ~inference_results_df[gt_column].isna()
# Filter for rows with labels
gt = inference_results_df[gt_column][keep_if_labeled]
pred = inference_results_df[pred_column][keep_if_labeled]
# Calculate mean squared error using the scikit-learn library
return mean_squared_error(gt, pred)Custom metrics can be added to metrics.py, which also contains the default metrics for reference. The metrics specified in the config will be calculated for the predictions.
To predict the labels for the test set when the ground truth is unknown, inference mode and use_test_set should be used. The library will generate the predictions for the report texts at args.data.test_set_data_path, saving them under args.save_path.
python -m strata.main inference configs/example/llama3.1-8b.yaml --inference-mode fine-tuned --opts exp_name example/llama3.1-8b-ft use_test_set True Let's finetune on toy data using this example config to improve the perfomance of the model.
First, benchmark zero shot inference:
python -m strata.main test configs/example/llama3.1-8b.yaml --inference-mode zero-shotThis should yield the following results:
Question All Correct F1 Precision Recall
0 source 100.0 100.0 100.0 100.0
1 cancer 30.0 41.7 75.0 29.2
2 overall 30.0 70.8 87.5 64.6
Note: for 'All Correct', the 'overall' metric is exact match over all questions. For other columns, the metric is averaged over questions.
Question Category All Correct F1 Precision Recall
0 Source_LB source 100.0 100.0 100.0 100.0
1 Source_RB source 100.0 100.0 100.0 100.0
2 Cancer_LB cancer 50.0 33.3 50.0 25.0
3 Cancer_RB cancer 80.0 50.0 100.0 33.3
The output for the first question is perfect, but the output for the second question is not perfect because the model, without fine-tuning on our medical dataset, cannot capture some nuances in the data.
Next, try finetuning the model:
python -m strata.main train configs/example/llama3.1-8b.yaml --opts exp_name example/llama3.1-8b-ftFinally, try the new checkpoint on the val set. It should take a few minutes to run.
python -m strata.main test configs/example/llama3.1-8b.yaml --inference-mode fine-tuned --opts exp_name example/llama3.1-8b-ftThe results should now be:
Question All Correct F1 Precision Recall
0 source 100.0 100.0 100.0 100.0
1 cancer 100.0 100.0 100.0 100.0
2 overall 100.0 100.0 100.0 100.0
Note: for 'All Correct', the 'overall' metric is exact match over all questions. For other columns, the metric is averaged over questions.
Question Category All Correct F1 Precision Recall
0 Source_LB source 100.0 100.0 100.0 100.0
1 Source_RB source 100.0 100.0 100.0 100.0
2 Cancer_LB cancer 100.0 100.0 100.0 100.0
3 Cancer_RB cancer 100.0 100.0 100.0 100.0
The model now has perfect accuracy on the val set, indicating that the finetuning process greatly improved the model's performance.