# Saving and Reading Results

Lighteval provides comprehensive logging and result management through the `EvaluationTracker` class. This system allows you to save results locally and optionally push them to various platforms for collaboration and analysis.

## Saving Results Locally

Lighteval automatically saves results and evaluation details in the
directory specified with the `--output-dir` option. The results are saved in
`{output_dir}/results/{model_name}/results_{timestamp}.json`. [Here is an
example of a result file](#example-of-a-result-file). The output path can be
any [fsspec](https://filesystem-spec.readthedocs.io/en/latest/index.html)
compliant path (local, S3, Hugging Face Hub, Google Drive, FTP, etc.).

To save detailed evaluation information, you can use the `--save-details`
option. The details are saved in Parquet files at
`{output_dir}/details/{model_name}/{timestamp}/details_{task}_{timestamp}.parquet`.

If you want results to be saved in a custom path structure, you can set the `results-path-template` option.
This allows you to specify a string template for the path. The template must contain the following
variables: `output_dir`, `model_name`, `org`. For example:
`{output_dir}/{org}_{model}`. The template will be used to create the path for the results file.

## Pushing Results to the Hugging Face Hub

You can push results and evaluation details to the Hugging Face Hub. To do
so, you need to set the `--push-to-hub` option as well as the `--results-org`
option. The results are saved in a dataset with the name
`{results_org}/{model_org}/{model_name}`. To push the details, you need to set
the `--save-details` option.

The dataset created will be private by default. You can make it public by
setting the `--public-run` option.

## Pushing Results to TensorBoard

You can push results to TensorBoard by setting `--push-to-tensorboard`.
This creates a TensorBoard dashboard in a Hugging Face organization specified with the `--results-org`
option.

## Pushing Results to Weights & Biases or Trackio

You can push results to Weights & Biases by setting `--wandb`. This initializes a W&B
run and logs the results.

W&B arguments need to be set in your environment variables:

```bash
export WANDB_PROJECT="lighteval"
```

You can find a complete list of variables in the [W&B documentation](https://docs.wandb.ai/guides/track/environment-variables/).

If Trackio is available in your environment (`pip install lighteval[trackio]`), it will be used to log and push results to a
Hugging Face dataset. Choose the dataset name and organization with:

```bash
export WANDB_SPACE_ID="org/name"
```

## How to Load and Investigate Details

### Loading from Local Detail Files

```python
from datasets import load_dataset
import os
import glob

output_dir = "evals_doc"
model_name = "HuggingFaceH4/zephyr-7b-beta"
timestamp = "latest"
task = "lighteval|gsm8k|0"

if timestamp == "latest":
    path = f"{output_dir}/details/{model_name}/*/"
    timestamps = glob.glob(path)
    timestamp = sorted(timestamps)[-1].split("/")[-2]
    print(f"Latest timestamp: {timestamp}")

details_path = f"{output_dir}/details/{model_name}/{timestamp}/details_{task}_{timestamp}.parquet"

# Load the details
details = load_dataset("parquet", data_files=details_path, split="train")

for detail in details:
    print(detail)
```

### Loading from the Hugging Face Hub

```python
from datasets import load_dataset

results_org = "SaylorTwift"
model_name = "HuggingFaceH4/zephyr-7b-beta"
sanitized_model_name = model_name.replace("/", "__")
task = "lighteval|gsm8k|0"
public_run = False

dataset_path = f"{results_org}/details_{sanitized_model_name}{'_private' if not public_run else ''}"
details = load_dataset(dataset_path, task.replace("|", "_"), split="latest")

for detail in details:
    print(detail)
```

## Detail File Structure

The detail file contains the following columns:

- **`__doc__`**: The document used for evaluation, containing the gold reference, few-shot examples, and other hyperparameters used for the task.
- **`__model_response__`**: Contains model generations, log probabilities, and the input that was sent to the model.
- **`__metric__`**: The value of the metrics for this sample.

## EvaluationTracker Configuration

The `EvaluationTracker` class provides several configuration options for customizing how results are saved and pushed:

### Basic Configuration

```python
from lighteval.logging.evaluation_tracker import EvaluationTracker

tracker = EvaluationTracker(
    output_dir="./results",
    save_details=True,
    push_to_hub=True,
    hub_results_org="your_username",
    public=False
)
```

### Advanced Configuration

```python
tracker = EvaluationTracker(
    output_dir="./results",
    results_path_template="{output_dir}/custom/{org}_{model}",
    save_details=True,
    push_to_hub=True,
    push_to_tensorboard=True,
    hub_results_org="my-org",
    tensorboard_metric_prefix="eval",
    public=True,
    use_wandb=True
)
```

### Key Parameters

- **`output_dir`**: Local directory to save evaluation results and logs
- **`results_path_template`**: Template for results directory structure
- **`save_details`**: Whether to save detailed evaluation records (default: True)
- **`push_to_hub`**: Whether to push results to Hugging Face Hub (default: False)
- **`push_to_tensorboard`**: Whether to push metrics to TensorBoard (default: False)
- **`hub_results_org`**: Hugging Face Hub organization to push results to
- **`tensorboard_metric_prefix`**: Prefix for TensorBoard metrics (default: "eval")
- **`public`**: Whether to make Hub datasets public (default: False)
- **`use_wandb`**: Whether to log to Weights & Biases or Trackio (default: False)

## Result File Structure

The main results file contains several sections:

### General Configuration
- **`config_general`**: Overall evaluation configuration including model information, timing, and system details
- **`summary_general`**: General statistics about the evaluation run

### Task-Specific Information
- **`config_tasks`**: Configuration details for each evaluated task
- **`summary_tasks`**: Task-specific statistics and metadata
- **`versions`**: Version information for tasks and datasets

### Results
- **`results`**: Actual evaluation metrics and scores for each task

## Example of a Result File

```json
{
  "config_general": {
    "lighteval_sha": "203045a8431bc9b77245c9998e05fc54509ea07f",
    "num_fewshot_seeds": 1,
    "max_samples": 1,
    "job_id": "",
    "start_time": 620979.879320166,
    "end_time": 621004.632108041,
    "total_evaluation_time_secondes": "24.752787875011563",
    "model_name": "gpt2",
    "model_sha": "607a30d783dfa663caf39e06633721c8d4cfcd7e",
    "model_dtype": null,
    "model_size": "476.2 MB"
  },
  "results": {
    "lighteval|gsm8k|0": {
      "em": 0.0,
      "em_stderr": 0.0,
      "maj@8": 0.0,
      "maj@8_stderr": 0.0
    },
    "all": {
      "em": 0.0,
      "em_stderr": 0.0,
      "maj@8": 0.0,
      "maj@8_stderr": 0.0
    }
  },
  "versions": {
    "lighteval|gsm8k|0": 0
  },
  "config_tasks": {
    "lighteval|gsm8k": {
      "name": "gsm8k",
      "prompt_function": "gsm8k",
      "hf_repo": "gsm8k",
      "hf_subset": "main",
      "metric": [
        {
          "metric_name": "em",
          "higher_is_better": true,
          "category": "3",
          "use_case": "5",
          "sample_level_fn": "compute",
          "corpus_level_fn": "mean"
        },
        {
          "metric_name": "maj@8",
          "higher_is_better": true,
          "category": "5",
          "use_case": "5",
          "sample_level_fn": "compute",
          "corpus_level_fn": "mean"
        }
      ],
      "hf_avail_splits": [
        "train",
        "test"
      ],
      "evaluation_splits": [
        "test"
      ],
      "few_shots_split": null,
      "few_shots_select": "random_sampling_from_train",
      "generation_size": 256,
      "generation_grammar": null,
      "stop_sequence": [
        "Question="
      ],
      "num_samples": null,
      "suite": [
        "lighteval"
      ],
      "original_num_docs": 1319,
      "effective_num_docs": 1,
      "must_remove_duplicate_docs": null,
      "version": 0
    }
  },
  "summary_tasks": {
    "lighteval|gsm8k|0": {
      "hashes": {
        "hash_examples": "8517d5bf7e880086",
        "hash_full_prompts": "8517d5bf7e880086",
        "hash_input_tokens": "29916e7afe5cb51d",
        "hash_cont_tokens": "37f91ce23ef6d435"
      },
      "padded": 0,
      "non_padded": 2,
      "effective_few_shots": 0.0,
    }
  },
  "summary_general": {
    "hashes": {
      "hash_examples": "5f383c395f01096e",
      "hash_full_prompts": "5f383c395f01096e",
      "hash_input_tokens": "ac933feb14f96d7b",
      "hash_cont_tokens": "9d03fb26f8da7277"
    },
    "padded": 0,
    "non_padded": 2,
  }
}
```


<EditOnGithub source="https://github.com/huggingface/lighteval/blob/main/docs/source/saving-and-reading-results.mdx" />