"""Server-end for the ASR demo.""" import os import time import random import argparse import distutils.util from time import gmtime, strftime import SocketServer import struct import wave import paddle.v2 as paddle from utils import print_arguments from data_utils.data import DataGenerator from model import DeepSpeech2Model from data_utils.utils import read_manifest parser = argparse.ArgumentParser(description=__doc__) parser.add_argument( "--host_ip", default="localhost", type=str, help="Server IP address. (default: %(default)s)") parser.add_argument( "--host_port", default=8086, type=int, help="Server Port. (default: %(default)s)") parser.add_argument( "--speech_save_dir", default="demo_cache", type=str, help="Directory for saving demo speech. (default: %(default)s)") parser.add_argument( "--vocab_filepath", default='datasets/vocab/eng_vocab.txt', type=str, help="Vocabulary filepath. (default: %(default)s)") parser.add_argument( "--mean_std_filepath", default='mean_std.npz', type=str, help="Manifest path for normalizer. (default: %(default)s)") parser.add_argument( "--warmup_manifest_path", default='datasets/manifest.test', type=str, help="Manifest path for warmup test. (default: %(default)s)") parser.add_argument( "--specgram_type", default='linear', type=str, help="Feature type of audio data: 'linear' (power spectrum)" " or 'mfcc'. (default: %(default)s)") parser.add_argument( "--num_conv_layers", default=2, type=int, help="Convolution layer number. (default: %(default)s)") parser.add_argument( "--num_rnn_layers", default=3, type=int, help="RNN layer number. (default: %(default)s)") parser.add_argument( "--rnn_layer_size", default=512, type=int, help="RNN layer cell number. (default: %(default)s)") parser.add_argument( "--use_gru", default=True, type=bool, help="Use GRU or simple RNN. (default: %(default)s)") parser.add_argument( "--use_gpu", default=True, type=distutils.util.strtobool, help="Use gpu or not. (default: %(default)s)") parser.add_argument( "--model_filepath", default='checkpoints/params.latest.tar.gz', type=str, help="Model filepath. (default: %(default)s)") parser.add_argument( "--decode_method", default='beam_search', type=str, help="Method for ctc decoding: best_path or beam_search. " "(default: %(default)s)") parser.add_argument( "--beam_size", default=100, type=int, help="Width for beam search decoding. (default: %(default)d)") parser.add_argument( "--language_model_path", default="lm/data/common_crawl_00.prune01111.trie.klm", type=str, help="Path for language model. (default: %(default)s)") parser.add_argument( "--alpha", default=0.36, type=float, help="Parameter associated with language model. (default: %(default)f)") parser.add_argument( "--beta", default=0.25, type=float, help="Parameter associated with word count. (default: %(default)f)") parser.add_argument( "--cutoff_prob", default=0.99, type=float, help="The cutoff probability of pruning" "in beam search. (default: %(default)f)") args = parser.parse_args() class AsrTCPServer(SocketServer.TCPServer): """The ASR TCP Server.""" def __init__(self, server_address, RequestHandlerClass, speech_save_dir, audio_process_handler, bind_and_activate=True): self.speech_save_dir = speech_save_dir self.audio_process_handler = audio_process_handler SocketServer.TCPServer.__init__( self, server_address, RequestHandlerClass, bind_and_activate=True) class AsrRequestHandler(SocketServer.BaseRequestHandler): """The ASR request handler.""" def handle(self): # receive data through TCP socket chunk = self.request.recv(1024) target_len = struct.unpack('>i', chunk[:4])[0] data = chunk[4:] while len(data) < target_len: chunk = self.request.recv(1024) data += chunk # write to file filename = self._write_to_file(data) print("Received utterance[length=%d] from %s, saved to %s." % (len(data), self.client_address[0], filename)) start_time = time.time() transcript = self.server.audio_process_handler(filename) finish_time = time.time() print("Response Time: %f, Transcript: %s" % (finish_time - start_time, transcript)) self.request.sendall(transcript) def _write_to_file(self, data): # prepare save dir and filename if not os.path.exists(self.server.speech_save_dir): os.mkdir(self.server.speech_save_dir) timestamp = strftime("%Y%m%d%H%M%S", gmtime()) out_filename = os.path.join( self.server.speech_save_dir, timestamp + "_" + self.client_address[0] + ".wav") # write to wav file file = wave.open(out_filename, 'wb') file.setnchannels(1) file.setsampwidth(4) file.setframerate(16000) file.writeframes(data) file.close() return out_filename def warm_up_test(audio_process_handler, manifest_path, num_test_cases, random_seed=0): """Warming-up test.""" manifest = read_manifest(manifest_path) rng = random.Random(random_seed) samples = rng.sample(manifest, num_test_cases) for idx, sample in enumerate(samples): print("Warm-up Test Case %d: %s", idx, sample['audio_filepath']) start_time = time.time() transcript = audio_process_handler(sample['audio_filepath']) finish_time = time.time() print("Response Time: %f, Transcript: %s" % (finish_time - start_time, transcript)) def start_server(): """Start the ASR server""" # prepare data generator data_generator = DataGenerator( vocab_filepath=args.vocab_filepath, mean_std_filepath=args.mean_std_filepath, augmentation_config='{}', specgram_type=args.specgram_type, num_threads=1) # prepare ASR model ds2_model = DeepSpeech2Model( vocab_size=data_generator.vocab_size, num_conv_layers=args.num_conv_layers, num_rnn_layers=args.num_rnn_layers, rnn_layer_size=args.rnn_layer_size, use_gru=args.use_gru, pretrained_model_path=args.model_filepath) # prepare ASR inference handler def file_to_transcript(filename): feature = data_generator.process_utterance(filename, "") result_transcript = ds2_model.infer_batch( infer_data=[feature], decode_method=args.decode_method, beam_alpha=args.alpha, beam_beta=args.beta, beam_size=args.beam_size, cutoff_prob=args.cutoff_prob, vocab_list=data_generator.vocab_list, language_model_path=args.language_model_path, num_processes=1) return result_transcript[0] # warming up with utterrances sampled from Librispeech print('-----------------------------------------------------------') print('Warming up ...') warm_up_test( audio_process_handler=file_to_transcript, manifest_path=args.warmup_manifest_path, num_test_cases=3) print('-----------------------------------------------------------') # start the server server = AsrTCPServer( server_address=(args.host_ip, args.host_port), RequestHandlerClass=AsrRequestHandler, speech_save_dir=args.speech_save_dir, audio_process_handler=file_to_transcript) print("ASR Server Started.") server.serve_forever() def main(): print_arguments(args) paddle.init(use_gpu=args.use_gpu, trainer_count=1) start_server() if __name__ == "__main__": main()