Add Corrective RAG LlamaPack (#10715)

* Add Corrective RAG LlamaPack

* Update with review suggestions

* Remove requirements.txt file

* Update BUILD

* Update examples

* Testing done

llama-index-packs/llama-index-packs-corrective-rag/.gitignore

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+llama_index/_static
+.DS_Store
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+bin/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+etc/
+include/
+lib/
+lib64/
+parts/
+sdist/
+share/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+.ruff_cache
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+notebooks/
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+pyvenv.cfg
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# Jetbrains
+.idea
+modules/
+*.swp
+
+# VsCode
+.vscode
+
+# pipenv
+Pipfile
+Pipfile.lock
+
+# pyright
+pyrightconfig.json

llama-index-packs/llama-index-packs-corrective-rag/BUILD

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+python_sources()
+
+poetry_requirements(
+    name="poetry",
+)

llama-index-packs/llama-index-packs-corrective-rag/Makefile

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+GIT_ROOT ?= $(shell git rev-parse --show-toplevel)
+
+help:	## Show all Makefile targets.
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[33m%-30s\033[0m %s\n", $$1, $$2}'
+
+format:	## Run code autoformatters (black).
+	pre-commit install
+	git ls-files | xargs pre-commit run black --files
+
+lint:	## Run linters: pre-commit (black, ruff, codespell) and mypy
+	pre-commit install && git ls-files | xargs pre-commit run --show-diff-on-failure --files
+
+test:	## Run tests via pytest.
+	pytest tests
+
+watch-docs:	## Build and watch documentation.
+	sphinx-autobuild docs/ docs/_build/html --open-browser --watch $(GIT_ROOT)/llama_index/

llama-index-packs/llama-index-packs-corrective-rag/README.md

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+# Corrective Retrieval Augmented Generation Llama Pack
+
+This LlamaPack implements the Corrective Retrieval Augmented Generation (CRAG) [paper](https://arxiv.org/pdf/2401.15884.pdf)
+
+Corrective Retrieval Augmented Generation (CRAG) is a method designed to enhance the robustness of language model generation by evaluating and augmenting the relevance of retrieved documents through a an evaluator and large-scale web searches, ensuring more accurate and reliable information is used in generation.
+
+This LlamaPack uses [Tavily AI](https://app.tavily.com/home) API for web-searches. So, we recommend you to get the api-key before proceeding further.
+
+### Installation
+
+```bash
+pip install llama-index llama-index-tools-tavily-research
+```
+
+## CLI Usage
+
+You can download llamapacks directly using `llamaindex-cli`, which comes installed with the `llama-index` python package:
+
+```bash
+llamaindex-cli download-llamapack CorrectiveRAGPack --download-dir ./corrective_rag_pack
+```
+
+You can then inspect the files at `./corrective_rag_pack` and use them as a template for your own project.
+
+## Code Usage
+
+You can download the pack to a the `./corrective_rag_pack` directory:
+
+```python
+from llama_index.core.llama_pack import download_llama_pack
+
+# download and install dependencies
+CorrectiveRAGPack = download_llama_pack(
+    "CorrectiveRAGPack", "./corrective_rag_pack"
+)
+
+# You can use any llama-hub loader to get documents!
+corrective_rag = CorrectiveRAGPack(documents, tavily_ai_api_key)
+```
+
+From here, you can use the pack, or inspect and modify the pack in `./corrective_rag_pack`.
+
+The `run()` function contains around logic behind Corrective Retrieval Augmented Generation - [CRAG](https://arxiv.org/pdf/2401.15884.pdf) paper.
+
+```python
+response = corrective_rag.run("<query>", similarity_top_k=2)
+```

llama-index-packs/llama-index-packs-corrective-rag/examples/BUILD

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+python_sources()