Add topics transformers

topics/langchain/index.md

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+---
+aliases: langchain-core
+created_by: hwchase17
+display_name: LangChain
+github_url: https://github.com/langchain-ai/langchain
+related: artificial-intelligence, llm, prompt-engineering, rag, agents
+short_description: LangChain is an open-source framework designed to simplify the creation of applications using large language models.
+topic: langchain
+url: https://www.langchain.com/
+wikipedia_url: https://en.wikipedia.org/wiki/LangChain
+---
+LangChain is an open source orchestration framework designed to help developers build context-aware, reasoning applications powered by large language models (LLMs). It provides modular abstractions for document loaders, vector stores, prompt templates, and autonomous agent workflows.

topics/transformers/index.md

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+---
+aliases: huggingface-transformers
+created_by: huggingface
+display_name: Transformers
+github_url: https://github.com/huggingface/transformer
+related: machine-learning, deep-learning, pytorch, nlp, artificial-intelligence
+short_description: Transformers provides thousands of pretrained models to perform tasks on different modalities such as text, vision, and audio.
+topic: transformers
+url: https://huggingface.co/docs/transformers
+wikipedia_url:
+---
+Transformers provides thousands of pretrained models to perform tasks on text, vision, and audio. Developed by Hugging Face, it simplifies downloading, training, and fine-tuning state-of-the-art architectures including BERT, GPT, Llama, and Whisper across PyTorch, TensorFlow, and JAX backends.