The following error occurred during model training.
ValueError: operands could not be broadcast together with shapes (1855,) (1855,64)
input : audio feature(waveform) , log mel spectrogram = 64
using librosa package
AudioAugmentation is not used.
I padded input(audio feature) with different length with class :clotho_collate_fn for the longest length. The detailed code is as follows.
settings_features=
{‘keep_raw_audio_data’: False,
‘process’: {‘sr’: 44100,
‘sr_resample’: 16000,
‘nb_fft’: 1024,
‘hop_size’: 512,
‘nb_mels’: 64,
‘window_function’: ‘hann’,
‘center’: True,
‘f_min’: 0.0,
‘f_max’: None,
‘htk’: False,
‘power’: 1.0,
‘norm’: 1}}
import numpy as np
import random
from tools.features_log_mel_bands import feature_extraction

from pathlib import Path
import pysndfx
import gc

import copy

from tools.file_io import load_audio_file
import torch


__author__ = 'Nikita Kuzmin -- Lomonosov Moscow State University'

class MixUp:

    def __init__(self, p, settings_features, simple_concat_captions=True,
                 sample_audio=False):

        self.p = p
        self.sample_audio = sample_audio
        self.settings_features = settings_features
        self.simple_concat_captions = simple_concat_captions

    def from_mel(self, mel):
        return 700 * (10 ** (mel / 2595.0) - 1)

    def to_mel(self, hertz):
        return 2595.0 * np.log10(1 + hertz / 700.0)

    def mix_audio(self, first_audio, second_audio):

        a = np.random.uniform(0.4, 0.6) #베타 분포에서 뽑음

        shorter, longer = first_audio, second_audio

        if shorter.shape[0] == longer.shape[0]:
            if self.sample_audio:
                return (longer + shorter) / 2.0
            else:
                longer = from_mel_to_audio(longer, **self.settings_features['process']) * a
                shorter = from_mel_to_audio(shorter,
                                            **self.settings_features['process'])
                return feature_extraction((longer + shorter) / 2, **self.settings_features['process'])

        if first_audio.shape[0] > second_audio.shape[0]:
            shorter, longer = longer, shorter


        if self.sample_audio:
            start = random.randint(0, longer.shape[0] - 1 - shorter.shape[0])
            end = start + shorter.shape[0]
            longer *= a
            longer[start:end] += np.dot(shorter,(1 - a)) #shorter * (1 - a)
        else:
            longer = from_mel_to_audio(longer, **self.settings_features['process']) * a
            shorter = from_mel_to_audio(shorter,
                                        **self.settings_features['process'])
            start = random.randint(0, longer.shape[0] - 1 - shorter.shape[0])
            end = start + shorter.shape[0]
            longer[start:end] += np.dot(shorter,(1 - a))
            longer = feature_extraction(longer,
                                        **self.settings_features['process'])

        return longer

    def mix_labels(self, first_labels, second_labels):
        if self.simple_concat_captions:
            return np.hstack([first_labels[:-1], second_labels[1:]])
        else:

            first_token = first_labels[0]
            last_token = first_labels[-1]
            first_labels = first_labels[1:-1]
            second_labels = second_labels[1:-1]
            res = np.empty((first_labels.size + second_labels.size,),
                           dtype=first_labels.dtype)
            min_size = min(first_labels.size, second_labels.size)
            res[0:2*min_size:2] = first_labels[:min_size]
            res[1:2*min_size:2] = second_labels[:min_size]
            if first_labels.size > second_labels.size:
                res[min_size * 2:] = first_labels[min_size:]
            elif second_labels.size > first_labels.size:
                res[min_size*2:] = second_labels[min_size:]
            res = np.concatenate(([first_token], res))
            res = np.concatenate((res, [last_token]))
            return res

    def mix_audio_and_labels(self,
                             first_audio, second_audio,
                             first_labels, second_labels):
        mixed_audio = self.mix_audio(first_audio, second_audio)
        mixed_labels = self.mix_labels(first_labels, second_labels)

        return mixed_audio, mixed_labels

    def __call__(self, dataset, inputs):
        resulted_audio, resulted_labels, filename = inputs[0], inputs[1], inputs[2]
        if np.random.uniform() <= self.p:
            random_sample = dataset.random_sample(sample_audio=self.sample_audio)
            resulted_audio, resulted_labels = self.mix_audio_and_labels(
                resulted_audio, random_sample[0],
                resulted_labels, random_sample[1]
            )
        return resulted_audio, resulted_labels


class AudioAugmentation:
    # https://github.com/ex4sperans/freesound-classification
    def __init__(self, p):

        self.p = p
        self.effects_chain = (
            pysndfx.AudioEffectsChain()
                .reverb(
                reverberance=random.randrange(50),
                room_scale=random.randrange(50),
                stereo_depth=random.randrange(50)
            )
                .pitch(shift=random.randrange(-300, 300))
                .overdrive(gain=random.randrange(2, 10))
                .speed(random.uniform(0.9, 1.1))
        )

    def __call__(self, dataset, inputs):

        resulted_audio = inputs[0]
        captions = inputs[1]
        del inputs
        gc.collect()
        if np.random.uniform() < self.p:
            resulted_audio = torch.from_numpy(self.effects_chain(resulted_audio.numpy()))
        return resulted_audio, captions


#clotho_collate_fn


#!/usr/bin/env python
# -*- coding: utf-8 -*-

from typing import MutableSequence, Union, Tuple, AnyStr
from numpy import ndarray
import torch
from torch import cat as pt_cat, zeros as pt_zeros, \
    ones as pt_ones, from_numpy, Tensor
from hparams import hparams as hp
from data_augmentation.SpecAugment import spec_augment

__author__ = 'Konstantinos Drossos -- Tampere University'
__docformat__ = 'reStructuredText'
__all__ = ['clotho_collate_fn']


def clotho_collate_fn(batch: MutableSequence[ndarray],
                      nb_t_steps: Union[AnyStr, Tuple[int, int]],
                      input_pad_at: str,
                      output_pad_at: str) \
        -> Tuple[Tensor, Tensor]:
    """Pads data.

    :param batch: Batch data.
    :type batch: list[numpy.ndarray]
    :param nb_t_steps: Number of time steps to\
                       pad/truncate to. Cab use\
                       'max', 'min', or exact number\
                       e.g. (1024, 10).
    :type nb_t_steps: str|(int, int)
    :param input_pad_at: Pad input at the start or\
                         at the end?
    :type input_pad_at: str
    :param output_pad_at: Pad output at the start or\
                          at the end?
    :type output_pad_at: str
    :return: Padded data.
    :rtype: torch.Tensor, torch.Tensor
    """
    if type(nb_t_steps) == str:
        truncate_fn = max if nb_t_steps.lower() == 'max' else min
        in_t_steps = truncate_fn([i[0].shape[0] for i in batch])
        out_t_steps = truncate_fn([i[1].shape[0] for i in batch])
    else:
        in_t_steps, out_t_steps = nb_t_steps

    in_dim = batch[0][0].shape[-1]
    eos_token = batch[0][1][-1]
    PAD = 4367

    input_tensor, output_tensor = [], []

    for in_b, out_b in batch:
        if in_t_steps >= in_b.shape[0]:
            padding = pt_zeros(in_t_steps - in_b.shape[0], in_dim).float()
            data = [from_numpy(in_b).float()]
            if input_pad_at.lower() == 'start':
                data.insert(0, padding)
            else:
                data.append(padding)
            tmp_in: Tensor = pt_cat(data)
        else:
            tmp_in: Tensor = from_numpy(in_b[:in_t_steps, :]).float()
        input_tensor.append(tmp_in.unsqueeze_(0))

        if out_t_steps >= out_b.shape[0]:
            padding = pt_ones(out_t_steps - len(out_b)).mul(PAD).long()
            data = [from_numpy(out_b).long()]
            if output_pad_at.lower() == 'start':
                data.insert(0, padding)
            else:
                data.append(padding)

            tmp_out: Tensor = pt_cat(data)
        else:
            tmp_out: Tensor = from_numpy(out_b[:out_t_steps]).long()
        output_tensor.append(tmp_out.unsqueeze_(0))

    input_tensor = pt_cat(input_tensor)
    output_tensor = pt_cat(output_tensor)

    
    file_names = [i[2] for i in batch]
    
    
    
    return input_tensor, output_tensor, file_names


def clotho_collate_fn_eval(batch: MutableSequence[ndarray],
                           nb_t_steps: Union[AnyStr, Tuple[int, int]],
                           input_pad_at: str,
                           output_pad_at: str,
                           split: str,
                           augment:bool) \
        -> Tuple[Tensor, Tensor, Tensor, list]:
    """Pads data.

    :param batch: Batch data.
    :type batch: list[numpy.ndarray]
    :param nb_t_steps: Number of time steps to\
                       pad/truncate to. Cab use\
                       'max', 'min', or exact number\
                       e.g. (1024, 10).
    :type nb_t_steps: str|(int, int)
    :param input_pad_at: Pad input at the start or\
                         at the end?
    :type input_pad_at: str
    :param output_pad_at: Pad output at the start or\
                          at the end?
    :type output_pad_at: str
    :return: Padded data.
    :rtype: torch.Tensor, torch.Tensor
    """
    if type(nb_t_steps) == str:
        truncate_fn = max if nb_t_steps.lower() == 'max' else min
        in_t_steps = truncate_fn([i[0].shape[0] for i in batch])
        out_t_steps = truncate_fn([i[1].shape[0] for i in batch])
    else:
        in_t_steps, out_t_steps = nb_t_steps

    in_dim = batch[0][0].shape[-1]
    eos_token = batch[0][1][-1]
    batch = sorted(batch, key=lambda x: x[-1],reverse=True)
    PAD = 4367
    input_tensor, output_tensor = [], []

    for in_b, out_b, ref, filename,out_len in batch:
        if in_t_steps >= in_b.shape[0]:
            padding = pt_zeros(in_t_steps - in_b.shape[0], in_dim).float()
            data = [from_numpy(in_b).float()]
            if input_pad_at.lower() == 'start':
                data.insert(0, padding)
            else:
                data.append(padding)
            tmp_in: Tensor = pt_cat(data)
        else:
            tmp_in: Tensor = from_numpy(in_b[:in_t_steps, :]).float()
        input_tensor.append(tmp_in.unsqueeze_(0))

        if out_t_steps >= out_b.shape[0]:
            padding = pt_ones(out_t_steps - len(out_b)).mul(PAD).long()
            data = [from_numpy(out_b).long()]
            if output_pad_at.lower() == 'start':
                data.insert(0, padding)
            else:
                data.append(padding)

            tmp_out: Tensor = pt_cat(data)
        else:
            tmp_out: Tensor = from_numpy(out_b[:out_t_steps]).long()
        output_tensor.append(tmp_out.unsqueeze_(0))

    input_tensor = pt_cat(input_tensor)

    if augment:
        input_tensor = spec_augment(input_tensor)

    output_tensor = pt_cat(output_tensor)
    all_ref = [i[2] for i in batch]
    filename = [i[3] for i in batch]
    *_, target_len = zip(*batch)
    target_len = torch.LongTensor(target_len)
    
    file_names = [i[2] for i in batch]
    
    return input_tensor, output_tensor,file_names,target_len, all_ref

# EOF


#!/usr/bin/env python
# -*- coding: utf-8 -*-

from typing import Tuple, List, AnyStr, Union
from pathlib import Path

from numpy import ndarray, recarray
from torch.utils.data import Dataset
from numpy import load as np_load


import torchaudio
import torch
import numpy as np
import os

__author__ = 'Konstantinos Drossos -- Tampere University'
__docformat__ = 'reStructuredText'
__all__ = ['ClothoDataset']


class ClothoDataset(Dataset):

    def __init__(self, data_dir: Path,
                 split: AnyStr,
                 input_field_name: AnyStr,
                 output_field_name: AnyStr,
                 load_into_memory: bool,
                transforms=None) \
            -> None:
        """Initialization of a Clotho dataset object.

        :param data_dir: Directory with data.
        :type data_dir: pathlib.Path
        :param split: Split to use (i.e. 'development', 'evaluation')
        :type split: str
        :param input_field_name: Field name of the clotho data\
                                 to be used as input data to the\
                                 method.
        :type input_field_name: str
        :param output_field_name: Field name of the clotho data\
                                 to be used as output data to the\
                                 method.
        :type output_field_name: str
        :param load_into_memory: Load all data into memory?
        :type load_into_memory: bool
        """
        super(ClothoDataset, self).__init__()
        the_dir: Path = data_dir.joinpath(split)

        self.examples: List[Path] = sorted(the_dir.iterdir())
        self.input_name: str = input_field_name
        self.output_name: str = output_field_name
        self.load_into_memory: bool = load_into_memory
        self.transforms = transforms
        self.resampler = torchaudio.transforms.Resample(orig_freq=settings_features['process']['sr'],
                                                        new_freq=settings_features['process']['sr_resample'])
            
            
            
        if load_into_memory:
            self.examples: List[recarray] = [np_load(str(f), allow_pickle=True)
                                             for f in self.examples]

    def __len__(self) \
            -> int:
        """Gets the amount of examples in the dataset.

        :return: Amount of examples in the dataset.
        :rtype: int
        """
        return len(self.examples)

    def __getitem__(self,
                    item: int) \
            -> Tuple[ndarray, ndarray]:
        """Gets an example from the dataset.

        :param item: Index of the item.
        :type item: int
        :return: Input and output values.
        :rtype: numpy.ndarray. numpy.ndarray
        """
        ex: Union[Path, recarray] = self.examples[item]
        if not self.load_into_memory:
            ex: recarray = np_load(str(ex), allow_pickle=True)

        in_e, ou_e = [ex[i].item() for i in [self.input_name, self.output_name]]

        return in_e, ou_e

class ClothoDatasetEval(Dataset):

    def __init__(self, data_dir: Path,
                 split: AnyStr,
                 input_field_name: AnyStr,
                 output_field_name: AnyStr,
                 load_into_memory: bool,
                 transforms=None) \
            -> None:
        """Initialization of a Clotho dataset object.

        :param data_dir: Directory with data.
        :type data_dir: pathlib.Path
        :param split: Split to use (i.e. 'development', 'evaluation')
        :type split: str
        :param input_field_name: Field name of the clotho data\
                                 to be used as input data to the\
                                 method.
        :type input_field_name: str
        :param output_field_name: Field name of the clotho data\
                                 to be used as output data to the\
                                 method.
        :type output_field_name: str
        :param load_into_memory: Load all data into memory?
        :type load_into_memory: bool
        """
        super(ClothoDatasetEval, self).__init__()
        the_dir: Path = data_dir.joinpath(split)
        self.split = split
        
        if split == 'evaluation':
            self.examples: List[Path] = sorted(the_dir.iterdir())[::5]  # changed
        else:
            self.examples: List[Path] = sorted(the_dir.iterdir())  # changed
        # self.examples: List[Path] = sorted(the_dir.iterdir())
        self.input_name: str = input_field_name
        self.output_name: str = output_field_name
        self.load_into_memory: bool = load_into_memory
        self.data_dir = the_dir
        self.transforms = transforms
        self.resampler = torchaudio.transforms.Resample(orig_freq=settings_features['process']['sr'],
                                                        new_freq=settings_features['process']['sr_resample'])  
        
        if load_into_memory:
            self.examples: List[recarray] = [np_load(str(f), allow_pickle=True)
                                             for f in self.examples]

    def __len__(self) \
            -> int:
        """Gets the amount of examples in the dataset.

        :return: Amount of examples in the dataset.
        :rtype: int
        """
        return len(self.examples)

    def __getitem__(self,
                    item: int):
        """Gets an example from the dataset.

        :param item: Index of the item.
        :type item: int
        :return: Input and output values.
        :rtype: numpy.ndarray. numpy.ndarray
        """
        ex: Union[Path, recarray] = self.examples[item]
        if not self.load_into_memory:
            ex: recarray = np_load(str(ex), allow_pickle=True)

        in_e, ou_e = [ex[i].item() for i in [self.input_name, self.output_name]]

        all_ref = get_all_ref(ex['file_name'].item(), self.data_dir)

        filename = str(ex['file_name'].item())
        out_len = len(ou_e)
        
        if self.transforms is not None:
            for transform in self.transforms:
                in_e, ou_e = transform(dataset=self, inputs=(in_e, ou_e, filename))
        

        return in_e, ou_e, all_ref, filename,out_len

     
    def random_sample(self, sample_audio=True):
        """
        Sampling audio or melspectrogram and encoded output
        :return:
        """

        item = random.randint(0, len(self.examples) - 1)
        ex = self.examples[item]
        if not self.load_into_memory:
            ex = np_load(str(ex), allow_pickle=True)
        #if sample_audio:
            thedir = Path('./create_dataset/data/clotho_audio_files/').joinpath(self.split)
            filename = Path(thedir, ex.file_name[0])
            in_e = torchaudio.load(filepath=filename)[0][0]
            in_e = self.resampler.forward(in_e)
            ou_e = ex[self.output_name].item()
        else:
            in_e, ou_e = [ex[i].item()
                          for i in [self.input_name, self.output_name]]

        return in_e, ou_e
            
            
def get_all_ref(filename, data_dir):
    filename = str(filename)
    # tgt = [np.load(d, allow_pickle=True).words_ind.tolist()
    tgt = [np.load(d, allow_pickle=True)['words_ind'].item().tolist()
           for d in [os.path.join(data_dir, 'clotho_file_{filename}.wav_{i}.npy'.
                                  format(filename=filename[:-4],  # 删除'.wav'
                                         i=i)) for i in range(5)]  # wav_0-wav_4
           ]
    return tgt
# EOF



#!/usr/bin/env python
# -*- coding: utf-8 -*-

from typing import Callable, Union, Tuple, AnyStr, Optional
from functools import partial
from pathlib import Path

from torch.utils.data.dataloader import DataLoader

from typing import MutableSequence, MutableMapping, Union,\
    Tuple, List




#from .clotho_dataset import ClothoDataset, ClothoDatasetEval
#from .collate_fn import clotho_collate_fn, clotho_collate_fn_eval

__author__ = 'Konstantinos Drossos'
__docformat__ = 'reStructuredText'
__all__ = ['get_clotho_loader']


def get_clotho_loader(data_dir: Path,
                      split: str,
                      settings_features:MutableMapping[
                          str, Union[str, bool, MutableMapping[str, str]]],
                      input_field_name: str,
                      output_field_name: str,
                      load_into_memory: bool,
                      batch_size: int,
                      nb_t_steps_pad: Union[AnyStr, Tuple[int, int]],
                      shuffle: Optional[bool] = True,
                      drop_last: Optional[bool] = True,
                      input_pad_at: Optional[str] = 'start',
                      output_pad_at: Optional[str] = 'end',
                      num_workers: Optional[int] = 1,
                      return_reference: Optional[bool] = False,
                      ) \
        -> DataLoader:
    """Gets the clotho data loader.

    :param return_reference:
    :param data_dir: Directory with data.
    :type data_dir: pathlib.Path
    :param split: Split to use (i.e. 'development', 'evaluation')
    :type split: str
    :param input_field_name: Field name of the clotho data\
                             to be used as input data to the\
                             method.
    :type input_field_name: str
    :param output_field_name: Field name of the clotho data\
                             to be used as output data to the\
                             method.
    :type output_field_name: str
    :param load_into_memory: Load all data into memory?
    :type load_into_memory: bool
    :param batch_size: Batch size to use.
    :type batch_size: int
    :param nb_t_steps_pad: Number of time steps to\
                           pad/truncate to. Cab use\
                           'max', 'min', or exact number\
                           e.g. (1024, 10).
    :type nb_t_steps_pad: str|(int, int)
    :param shuffle: Shuffle examples? Defaults to True.
    :type shuffle: bool, optional
    :param drop_last: Drop the last examples if not making\
                      a batch of `batch_size`? Defaults to True.
    :type drop_last: bool, optional
    :param input_pad_at: Pad input at the start or\
                         at the end?
    :type input_pad_at: str
    :param output_pad_at: Pad output at the start or\
                          at the end?
    :type output_pad_at: str
    :param num_workers: Amount of workers, defaults to 1.
    :type num_workers: int, optional
    :return: Dataloader for Clotho data.
    :rtype: torch.utils.data.dataloader.DataLoader
    """

    transforms = []
    transforms.append(MixUp(p=0.5,
                              settings_features=settings_features,
                              simple_concat_captions=True,
                              sample_audio=True))

    if return_reference:
        dataset: ClothoDatasetEval = ClothoDatasetEval(
            data_dir=data_dir, split=split,
            input_field_name=input_field_name,
            output_field_name=output_field_name,
            load_into_memory=load_into_memory,transforms=transforms)

        collate_fn: Callable = partial(
            clotho_collate_fn_eval,
            nb_t_steps=nb_t_steps_pad,
            input_pad_at=input_pad_at,
            output_pad_at=output_pad_at, split=split)
    else:
        dataset: ClothoDataset = ClothoDataset(
            data_dir=data_dir, split=split,
            input_field_name=input_field_name,
            output_field_name=output_field_name,
            load_into_memory=load_into_memory)

        collate_fn: Callable = partial(
            clotho_collate_fn,
            nb_t_steps=nb_t_steps_pad,
            input_pad_at=input_pad_at,
            output_pad_at=output_pad_at)

    return DataLoader(
        dataset=dataset, batch_size=batch_size,
        shuffle=shuffle, num_workers=num_workers,
        drop_last=drop_last, collate_fn=collate_fn)

# EOF


학습 데이터 정의
training_data = get_clotho_loader(data_dir=data_dir, split='development',
                                  settings_features=settings['feature_extraction_settings'],    
                                  input_field_name='features',
                                      output_field_name='words_ind',
                                      load_into_memory=False,
                                      batch_size=hp.batch_size,
                                      nb_t_steps_pad='max',
                                      num_workers=4, return_reference=True)


학습
def train():
    model.train()
    total_loss_text = 0.
    start_time = time.time()
    batch = 0
    for src, tgt, tgt_len, ref in training_data:
        src = src.to(device)
        tgt = tgt.to(device)
        tgt_pad_mask = get_padding(tgt, tgt_len)
        tgt_in = tgt[:, :-1]
        tgt_pad_mask = tgt_pad_mask[:, :-1]
        tgt_y = tgt[:, 1:]

        optimizer.zero_grad()
        output = model(src, tgt_in, target_padding_mask=tgt_pad_mask)

        loss_text = criterion(output.contiguous().view(-1, hp.ntoken), tgt_y.transpose(0, 1).contiguous().view(-1))
        loss = loss_text
        loss.backward()

        torch.nn.utils.clip_grad_norm_(model.parameters(), hp.clip_grad)
        optimizer.step()
        total_loss_text += loss_text.item()

        writer.add_scalar('Loss/train-text', loss_text.item(), (epoch - 1) * len(training_data) + batch)

        batch += 1

        if batch % hp.log_interval == 0 and batch > 0:
            mean_text_loss = total_loss_text / hp.log_interval
            elapsed = time.time() - start_time
            current_lr = [param_group['lr'] for param_group in optimizer.param_groups][0]
            logging.info('| epoch {:3d} | {:5d}/{:5d} batches | lr {:02.2e} | ms/batch {:5.2f} | '
                         'loss-text {:5.4f}'.format(
                epoch, batch, len(training_data), current_lr,
                elapsed * 1000 / hp.log_interval, mean_text_loss))
            total_loss_text = 0
            start_time = time.time()

epoch = 1
if hp.mode == 'train':
    while epoch < hp.training_epochs + 1:
        epoch_start_time = time.time()
        train()
        torch.save(model.state_dict(), '{log_dir}/{num_epoch}.pt'.format(log_dir=log_dir, num_epoch=epoch))
        scheduler.step(epoch)
        eval_all(evaluation_beam, word_dict_pickle_path=word_dict_pickle_path)
        eval_with_beam(evaluation_beam, max_len=30, eos_ind=9, word_dict_pickle_path=word_dict_pickle_path,
                           beam_size=2)
        eval_with_beam(evaluation_beam, max_len=30, eos_ind=9, word_dict_pickle_path=word_dict_pickle_path,
                           beam_size=3)
        eval_with_beam(evaluation_beam, max_len=30, eos_ind=9, word_dict_pickle_path=word_dict_pickle_path,
                           beam_size=4)
        epoch += 1

에러발생
ValueError: Caught ValueError in DataLoader worker process 0.
Original Traceback (most recent call last):
File “/home/hj20/anaconda3/lib/python3.7/site-packages/torch/utils/data/_utils/worker.py”, line 202, in _worker_loop
data = fetcher.fetch(index)
File “/home/hj20/anaconda3/lib/python3.7/site-packages/torch/utils/data/_utils/fetch.py”, line 44, in fetch
data = [self.dataset[idx] for idx in possibly_batched_index]
File “/home/hj20/anaconda3/lib/python3.7/site-packages/torch/utils/data/_utils/fetch.py”, line 44, in 
data = [self.dataset[idx] for idx in possibly_batched_index]
File “”, line 171, in getitem
in_e, ou_e = transform(dataset=self, inputs=(in_e, ou_e, filename))
File “”, line 105, in call
resulted_labels, random_sample[1]
File “”, line 94, in mix_audio_and_labels
mixed_audio = self.mix_audio(first_audio, second_audio)
File “”, line 56, in mix_audio
longer[start:end] += np.dot(shorter,(1 - a)) #shorter * (1 - a)
ValueError: operands could not be broadcast together with shapes (1855,) (1855,64)
help me ㅠㅠ