### Dataset Structure
The dataset structure is as follows:
|---- Folder (first-level label)
        |----- Folder (second-level label)
                |------ video               # Store mp4 files
                |------ audio               # Store wav files
                |------ caption.csv         # Header: video, audio, audio_tag, video_caption, audio_caption

### Distribution:
![Distribution](distribution.png "Distribution")
```
{ 
    'Vehicle': { 
        'Boat, Water vehicle': 236,
        'Aircraft': 585,
        'Motor vehicle (road)': 3339,
        'Rail transport': 848,
        'Non-motorized land vehicle': 678
    },
    'Human sounds': { 
        'Digestive': 48,
        'Human group actions': 31,
        'Whistling': 1,
        'Respiratory sounds': 14,
        'Human voice': 46,
        'Human locomotion': 1053,
        'Hands': 363
    },
    'Animal': { 
        'Domestic animals, pets': 19,
        'Livestock, farm animals, working animals': 29,
        'Wild animals': 654
    },
    'Domestic sounds, home sounds': { 
        'Cutlery, silverware': 22,
        'Chopping (food)': 467,
        'Scissors': 42,
        'Vacuum cleaner': 259,
        'Hair dryer': 1,
        'Microwave oven': 7,
        'Drawer open or close': 19,
        'Velcro, hook and loop fastener': 87,
        'Cupboard open or close': 16,
        'Kettle whistle': 71,
        'Bathtub (filling or washing)': 257,
        'Sink (filling or washing)': 23,
        'Shuffling cards': 11,
        'Water tap, faucet': 80,
        'Frying (food)': 80,
        'Dishes, pots, and pans': 224,
        'Door': 34,
        'Typing': 386,
        'Blender': 172,
        'Packing tape, duct tape': 90,
        'Writing': 553,
        'Other sourceless': 2429,
        'Zipper (clothing)': 97
    },
    'Tools': { 
        'Power tool': 590,
        'Filing (rasp)': 56,
        'Hammer': 762,
        'Jackhammer': 4,
        'Sawing': 312,
        'Other sourceless': 147,
        'Sanding': 82
    },
    'Sounds of other things': { 
        'Wood': 44,
        'Liquid': 29,
        'Explosion': 124,
        'Other sourceless': 463,
        'Specific impact sounds': 18,
        'Glass': 76,
        'Alarm': 8,
        'Bell': 4,
        'Mechanisms': 943,
        'Engine': 233
    },
    'Natural sounds': { 
        'Thunderstorm': 49,
        'Wind': 331,
        'Water': 1982,
        'Fire': 213,
        'Other sourceless': 326
    },
    'Music': { 
        'Musical instrument': 29,
        'Music genre': 160,
        'Musical concepts': 32,
        'Music role': 12
    },
    'Others': { 
        'Source-ambiguous sounds': 191,
        'environment and background': 344
    }
}
```

###