149 lines
4.5 KiB
Ruby
149 lines
4.5 KiB
Ruby
# frozen_string_literal: true
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module ::DiscourseAi
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module Inference
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class HuggingFaceTextGeneration
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CompletionFailed = Class.new(StandardError)
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TIMEOUT = 60
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def self.perform!(
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prompt,
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model,
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temperature: 0.7,
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top_p: nil,
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top_k: nil,
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typical_p: nil,
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max_tokens: 2000,
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repetition_penalty: 1.1,
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user_id: nil,
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tokenizer: DiscourseAi::Tokenizer::Llama2Tokenizer,
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token_limit: nil
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)
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raise CompletionFailed if model.blank?
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url = URI(SiteSetting.ai_hugging_face_api_url)
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if block_given?
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url.path = "/generate_stream"
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else
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url.path = "/generate"
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end
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headers = { "Content-Type" => "application/json" }
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if SiteSetting.ai_hugging_face_api_key.present?
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headers["Authorization"] = "Bearer #{SiteSetting.ai_hugging_face_api_key}"
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end
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token_limit = token_limit || SiteSetting.ai_hugging_face_token_limit
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parameters = {}
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payload = { inputs: prompt, parameters: parameters }
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prompt_size = tokenizer.size(prompt)
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parameters[:top_p] = top_p if top_p
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parameters[:top_k] = top_k if top_k
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parameters[:typical_p] = typical_p if typical_p
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parameters[:max_new_tokens] = token_limit - prompt_size
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parameters[:temperature] = temperature if temperature
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parameters[:repetition_penalty] = repetition_penalty if repetition_penalty
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Net::HTTP.start(
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url.host,
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url.port,
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use_ssl: url.scheme == "https",
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read_timeout: TIMEOUT,
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open_timeout: TIMEOUT,
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write_timeout: TIMEOUT,
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) do |http|
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request = Net::HTTP::Post.new(url, headers)
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request_body = payload.to_json
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request.body = request_body
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http.request(request) do |response|
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if response.code.to_i != 200
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Rails.logger.error(
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"HuggingFaceTextGeneration: status: #{response.code.to_i} - body: #{response.body}",
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)
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raise CompletionFailed
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end
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log =
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AiApiAuditLog.create!(
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provider_id: AiApiAuditLog::Provider::HuggingFaceTextGeneration,
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raw_request_payload: request_body,
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user_id: user_id,
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)
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if !block_given?
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response_body = response.read_body
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parsed_response = JSON.parse(response_body, symbolize_names: true)
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log.update!(
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raw_response_payload: response_body,
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request_tokens: tokenizer.size(prompt),
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response_tokens: tokenizer.size(parsed_response[:generated_text]),
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)
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return parsed_response
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end
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response_data = +""
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begin
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cancelled = false
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cancel = lambda { cancelled = true }
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response_raw = +""
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response.read_body do |chunk|
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if cancelled
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http.finish
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return
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end
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response_raw << chunk
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chunk
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.split("\n")
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.each do |line|
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data = line.split("data:", 2)[1]
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next if !data || data.squish == "[DONE]"
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if !cancelled
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begin
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# partial contains the entire payload till now
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partial = JSON.parse(data, symbolize_names: true)
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# this is the last chunk and contains the full response
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next if partial[:token][:special] == true
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response_data << partial[:token][:text].to_s
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yield partial, cancel
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rescue JSON::ParserError
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nil
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end
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end
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end
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rescue IOError
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raise if !cancelled
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ensure
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log.update!(
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raw_response_payload: response_raw,
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request_tokens: tokenizer.size(prompt),
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response_tokens: tokenizer.size(response_data),
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)
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end
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end
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return response_data
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end
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end
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def self.try_parse(data)
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JSON.parse(data, symbolize_names: true)
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rescue JSON::ParserError
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nil
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end
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end
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end
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end
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end
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