mg2_data.py

# -*- coding: utf-8 -*-
"""Untitled2.ipynb

Automatically generated by Colaboratory.

Original file is located at
    https://colab.research.google.com/drive/1Jy8fwFO774TM_FTwK-0to2L0qHoUAT-U
"""

# -*- coding: utf-8 -*-
"""MGB2.ipynb
Automatically generated by Colaboratory.
Original file is located at
    https://colab.research.google.com/drive/15ejoy2EWN9bj2s5ORQRZb5aTmFlcgA9d
"""

import datasets
import os


_DESCRIPTION = "MGB2 speech recognition dataset AR"
_HOMEPAGE = "https://arabicspeech.org/mgb2/"
_LICENSE = "MGB-2 License agreement"
_CITATION = """@misc{https://doi.org/10.48550/arxiv.1609.05625,
  doi = {10.48550/ARXIV.1609.05625},
  
  url = {https://arxiv.org/abs/1609.05625},
  
  author = {Ali, Ahmed and Bell, Peter and Glass, James and Messaoui, Yacine and Mubarak, Hamdy and Renals, Steve and Zhang, Yifan},
  
  keywords = {Computation and Language (cs.CL), FOS: Computer and information sciences, FOS: Computer and information sciences},
  
  title = {The MGB-2 Challenge: Arabic Multi-Dialect Broadcast Media Recognition},
  
  publisher = {arXiv},
  
  year = {2016},
  
  copyright = {arXiv.org perpetual, non-exclusive license}
}
"""
_DATA_ARCHIVE_ROOT = "Data/archives/"
_DATA_URL = {
    "test": _DATA_ARCHIVE_ROOT + "mgb2_wav.test.zip",
    "dev": _DATA_ARCHIVE_ROOT + "mgb2_wav.dev.zip",
    "train": _DATA_ARCHIVE_ROOT + "mgb2_wav.train.zip",

    #"train": [_DATA_ARCHIVE_ROOT + f"mgb2_wav_{x}.train.tar.gz" for x in range(48)], # we have 48 archives
}
_TEXT_URL = {
    "test": _DATA_ARCHIVE_ROOT + "mgb2_txt.test.zip",
    "dev": _DATA_ARCHIVE_ROOT + "mgb2_txt.dev.zip",
    "train": _DATA_ARCHIVE_ROOT + "mgb2_txt.train.zip",
}



def absoluteFilePaths(directory):
    for dirpath,_,filenames in os.walk(directory):
        for f in filenames:
            yield os.path.abspath(os.path.join(dirpath, f))

            
class MGDB2Dataset(datasets.GeneratorBasedBuilder):
    def _info(self):
        return datasets.DatasetInfo(
        description=_DESCRIPTION,
        features=datasets.Features(
            {
                "path": datasets.Value("string"),
                "audio": datasets.Audio(sampling_rate=16_000),
                "sentence": datasets.Value("string"),
            }
        ),
        supervised_keys=None,
        homepage=_HOMEPAGE,
        license=_LICENSE,
        citation=_CITATION,
    )

    def _split_generators(self, dl_manager):
        wav_archive = dl_manager.download(_DATA_URL)
        txt_archive = dl_manager.download(_TEXT_URL)
        test_dir = "dataset/test"
        dev_dir = "dataset/dev"
        train_dir = "dataset/train"


        print("Starting write datasets.........................................................")
        
        
        if dl_manager.is_streaming:
            print("from streaming.........................................................")



            
            return [
            datasets.SplitGenerator(
                name=datasets.Split.TEST,
                gen_kwargs={
                    "path_to_txt": test_dir + "/txt",
                    "path_to_wav": test_dir + "/wav",
                    "wav_files": dl_manager.iter_archive(wav_archive['test']),
                    "txt_files": dl_manager.iter_archive(txt_archive['test']),
                },
            ),
            datasets.SplitGenerator(
                name=datasets.Split.VALIDATION,
                gen_kwargs={
                    "path_to_txt": dev_dir + "/txt",
                    "path_to_wav": dev_dir + "/wav",
                    "wav_files": dl_manager.iter_archive(wav_archive['dev']),
                    "txt_files": dl_manager.iter_archive(txt_archive['dev']),
                },
            ),
            datasets.SplitGenerator(
                name=datasets.Split.TRAIN,
                gen_kwargs={
                    "path_to_txt": train_dir + "/txt",
                    "path_to_wav": train_dir + "/wav",
                    "wav_files": dl_manager.iter_archive(wav_archive['train']),
                    "txt_files": dl_manager.iter_archive(txt_archive['train']),
                },
            ),
        ]
        else:
            print("from non streaming.........................................................")


            dstZipFileName=txt_archive['test']

            sz=os.path.getsize(dstZipFileName)

            print("file size=",sz)
            
            
            #test_txt_files=dl_manager.extract(txt_archive['test']);

            #flist=os.listdir(test_txt_files)

            #print(flist)
            
            #f = open(test_txt_files, 'r')
            #file_contents = f.read()
            #print (file_contents)
            #f.close()
            
            return [
            datasets.SplitGenerator(
                name=datasets.Split.TEST,
                gen_kwargs={
                    "path_to_txt": test_dir + "/txt",
                    "path_to_wav": test_dir + "/wav",
                    "wav_files": absoluteFilePaths(dl_manager.extract(wav_archive['test'])),
                    "txt_files":  absoluteFilePaths(dl_manager.extract(txt_archive['test'])),
                    "data_type":2,
                },
            ),
            datasets.SplitGenerator(
                name=datasets.Split.VALIDATION,
                gen_kwargs={
                    "path_to_txt": dev_dir + "/txt",
                    "path_to_wav": dev_dir + "/wav",
                    "wav_files": absoluteFilePaths(dl_manager.extract(wav_archive['dev'])),
                    "txt_files": absoluteFilePaths(dl_manager.extract(txt_archive['dev'])),
                    "data_type":1,
                },
            ),
            datasets.SplitGenerator(
                name=datasets.Split.TRAIN,
                gen_kwargs={
                    "path_to_txt": train_dir + "/txt",
                    "path_to_wav": train_dir + "/wav",
                    "wav_files": absoluteFilePaths(dl_manager.extract(wav_archive['train'])),
                    "txt_files": absoluteFilePaths(dl_manager.extract(txt_archive['train'])),
                    "data_type":0,
                },
            ),
        ]
    print("end of generation.........................................................")
      

#0 --> train
#1--> validation
#2-->test
    
    def _generate_examples(self, path_to_txt, path_to_wav, wav_files, txt_files,data_type):
        """ 
        This assumes that the text directory alphabetically precedes the wav dir
        The file names for wav and text seem to match and are unique
        We can use them for the dictionary matching them
        """

        print("start of generate examples.........................................................")

        print("txt file names............................",txt_files)
        print("wav_files names....................................",wav_files)

        examples = {}
        id_ = 0
        # need to prepare the transcript - wave map
        for item in txt_files:


            #print("copying txt file...............",item)
      
            if type(item) is tuple:
                # iter_archive will return path and file
                path, f = item
                txt = f.read().decode(encoding="utf-8").strip()
            else:
                # extract will return path only
                path = item
                with open(path, encoding="utf-8") as f:
                    txt = f.read().strip()

            #if os.path.exists(path_to_txt)==False:
            #    os.makedirs(path_to_txt)
            #if path.find(path_to_txt) > -1:
                # construct the wav path
                # which is used as an identifier
            wav_path = os.path.split(path)[1].replace("_utf8", "").replace(".txt", ".wav").strip()
            #print(wav_path)
            examples[wav_path] = {
                "sentence": txt,
                "path": wav_path,
            }

        #for wf in wav_files:
            #print(wf)
        for item in wav_files:#wf:
            #print(item)
            if type(item) is tuple:
                path, f = item
                wav_data = f.read()
            else:
                path = item
                with open(path, "rb") as f:
                    wav_data = f.read()
            #if os.path.exists(path_to_wav)==False:
            #    os.makedirs(path_to_wav)
            #if path.find(path_to_wav) > -1:
            wav_path = os.path.split(path)[1].strip()
            if not (wav_path in examples):
                print("wav file mismatch:",wav_path)
                continue
            audio = {"path": path, "bytes": wav_data}
            yield id_, {**examples[wav_path], "audio": audio}
            id_ += 1