anything-llm/server/utils/EmbeddingEngines/openAi/index.js

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const { toChunks } = require("../../helpers");
class OpenAiEmbedder {
constructor() {
const { Configuration, OpenAIApi } = require("openai");
if (!process.env.OPEN_AI_KEY) throw new Error("No OpenAI API key was set.");
const config = new Configuration({
apiKey: process.env.OPEN_AI_KEY,
});
const openai = new OpenAIApi(config);
this.openai = openai;
// Arbitrary limit of string size in chars to ensure we stay within reasonable POST request size.
this.embeddingMaxChunkLength = 1_000;
}
async embedTextInput(textInput) {
const result = await this.embedChunks(textInput);
return result?.[0] || [];
}
async embedChunks(textChunks = []) {
// Because there is a hard POST limit on how many chunks can be sent at once to OpenAI (~8mb)
// we concurrently execute each max batch of text chunks possible.
// Refer to constructor embeddingMaxChunkLength for more info.
const embeddingRequests = [];
for (const chunk of toChunks(textChunks, this.embeddingMaxChunkLength)) {
embeddingRequests.push(
new Promise((resolve) => {
this.openai
.createEmbedding({
model: "text-embedding-ada-002",
input: chunk,
})
.then((res) => {
resolve({ data: res.data?.data, error: null });
})
.catch((e) => {
resolve({ data: [], error: e?.error });
});
})
);
}
const { data = [], error = null } = await Promise.all(
embeddingRequests
).then((results) => {
// If any errors were returned from OpenAI abort the entire sequence because the embeddings
// will be incomplete.
const errors = results
.filter((res) => !!res.error)
.map((res) => res.error)
.flat();
if (errors.length > 0) {
return {
data: [],
error: `(${errors.length}) Embedding Errors! ${errors
.map((error) => `[${error.type}]: ${error.message}`)
.join(", ")}`,
};
}
return {
data: results.map((res) => res?.data || []).flat(),
error: null,
};
});
if (!!error) throw new Error(`OpenAI Failed to embed: ${error}`);
return data.length > 0 &&
data.every((embd) => embd.hasOwnProperty("embedding"))
? data.map((embd) => embd.embedding)
: null;
}
}
module.exports = {
OpenAiEmbedder,
};