Embedders

Embedders convert text into numerical vectors for similarity search.

Available Embedders

Embedder	Type	Cost	Dimension
TFIDFEmbedder	Sparse	Free	Variable
BM25Embedder	Sparse	Free	Variable
SentenceTransformerEmbedder	Dense	Free	384
OpenAIEmbedder	Dense	Paid	1536
GoogleEmbedder	Dense	Paid	768

TF-IDF (Default)

from prompt_amplifier.embedders import TFIDFEmbedder

embedder = TFIDFEmbedder()

Fast, keyword-based matching. Best for exact term matches.

Sentence Transformers

from prompt_amplifier.embedders import SentenceTransformerEmbedder

embedder = SentenceTransformerEmbedder(model="all-MiniLM-L6-v2")

Semantic understanding. Free and runs locally.

OpenAI

from prompt_amplifier.embedders import OpenAIEmbedder

embedder = OpenAIEmbedder(
    model="text-embedding-3-small",
    api_key="sk-..."  # or set OPENAI_API_KEY
)

High quality. Requires API key.

Google

from prompt_amplifier.embedders import GoogleEmbedder

embedder = GoogleEmbedder(
    model="text-embedding-004",
    api_key="AIza..."  # or set GOOGLE_API_KEY
)