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| import sys | |
| import os | |
| import librosa | |
| import numpy as np | |
| import torch | |
| import audio_to_text.captioning.models | |
| import audio_to_text.captioning.models.encoder | |
| import audio_to_text.captioning.models.decoder | |
| import audio_to_text.captioning.utils.train_util as train_util | |
| def load_model(config, checkpoint): | |
| ckpt = torch.load(checkpoint, "cpu") | |
| encoder_cfg = config["model"]["encoder"] | |
| encoder = train_util.init_obj( | |
| audio_to_text.captioning.models.encoder, | |
| encoder_cfg | |
| ) | |
| if "pretrained" in encoder_cfg: | |
| pretrained = encoder_cfg["pretrained"] | |
| train_util.load_pretrained_model(encoder, | |
| pretrained, | |
| sys.stdout.write) | |
| decoder_cfg = config["model"]["decoder"] | |
| if "vocab_size" not in decoder_cfg["args"]: | |
| decoder_cfg["args"]["vocab_size"] = len(ckpt["vocabulary"]) | |
| decoder = train_util.init_obj( | |
| audio_to_text.captioning.models.decoder, | |
| decoder_cfg | |
| ) | |
| if "word_embedding" in decoder_cfg: | |
| decoder.load_word_embedding(**decoder_cfg["word_embedding"]) | |
| if "pretrained" in decoder_cfg: | |
| pretrained = decoder_cfg["pretrained"] | |
| train_util.load_pretrained_model(decoder, | |
| pretrained, | |
| sys.stdout.write) | |
| model = train_util.init_obj(audio_to_text.captioning.models, config["model"], | |
| encoder=encoder, decoder=decoder) | |
| train_util.load_pretrained_model(model, ckpt) | |
| model.eval() | |
| return { | |
| "model": model, | |
| "vocabulary": ckpt["vocabulary"] | |
| } | |
| def decode_caption(word_ids, vocabulary): | |
| candidate = [] | |
| for word_id in word_ids: | |
| word = vocabulary[word_id] | |
| if word == "<end>": | |
| break | |
| elif word == "<start>": | |
| continue | |
| candidate.append(word) | |
| candidate = " ".join(candidate) | |
| return candidate | |
| class AudioCapModel(object): | |
| def __init__(self,weight_dir,device='cpu'): | |
| config = os.path.join(weight_dir,'config.yaml') | |
| self.config = train_util.parse_config_or_kwargs(config) | |
| checkpoint = os.path.join(weight_dir,'swa.pth') | |
| resumed = load_model(self.config, checkpoint) | |
| model = resumed["model"] | |
| self.vocabulary = resumed["vocabulary"] | |
| self.model = model.to(device) | |
| self.device = device | |
| def caption(self,audio_list): | |
| if isinstance(audio_list,np.ndarray): | |
| audio_list = [audio_list] | |
| elif isinstance(audio_list,str): | |
| audio_list = [librosa.load(audio_list,sr=32000)[0]] | |
| captions = [] | |
| for wav in audio_list: | |
| inputwav = torch.as_tensor(wav).float().unsqueeze(0).to(self.device) | |
| wav_len = torch.LongTensor([len(wav)]) | |
| input_dict = { | |
| "mode": "inference", | |
| "wav": inputwav, | |
| "wav_len": wav_len, | |
| "specaug": False, | |
| "sample_method": "beam", | |
| } | |
| print(input_dict) | |
| out_dict = self.model(input_dict) | |
| caption_batch = [decode_caption(seq, self.vocabulary) for seq in \ | |
| out_dict["seq"].cpu().numpy()] | |
| captions.extend(caption_batch) | |
| return captions | |
| def __call__(self, audio_list): | |
| return self.caption(audio_list) | |