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shapenet.py
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import json
import os
import os.path as osp
from typing import Callable, List, Optional, Union
import torch
from torch_geometric.data import (
Data,
InMemoryDataset,
download_url,
extract_zip,
)
from torch_geometric.io import fs, read_txt_array
class ShapeNet(InMemoryDataset):
r"""The ShapeNet part level segmentation dataset from the `"A Scalable
Active Framework for Region Annotation in 3D Shape Collections"
<http://web.stanford.edu/~ericyi/papers/part_annotation_16_small.pdf>`_
paper, containing about 17,000 3D shape point clouds from 16 shape
categories.
Each category is annotated with 2 to 6 parts.
Args:
root (str): Root directory where the dataset should be saved.
categories (str or [str], optional): The category of the CAD models
(one or a combination of :obj:`"Airplane"`, :obj:`"Bag"`,
:obj:`"Cap"`, :obj:`"Car"`, :obj:`"Chair"`, :obj:`"Earphone"`,
:obj:`"Guitar"`, :obj:`"Knife"`, :obj:`"Lamp"`, :obj:`"Laptop"`,
:obj:`"Motorbike"`, :obj:`"Mug"`, :obj:`"Pistol"`, :obj:`"Rocket"`,
:obj:`"Skateboard"`, :obj:`"Table"`).
Can be explicitly set to :obj:`None` to load all categories.
(default: :obj:`None`)
include_normals (bool, optional): If set to :obj:`False`, will not
include normal vectors as input features to :obj:`data.x`.
As a result, :obj:`data.x` will be :obj:`None`.
(default: :obj:`True`)
split (str, optional): If :obj:`"train"`, loads the training dataset.
If :obj:`"val"`, loads the validation dataset.
If :obj:`"trainval"`, loads the training and validation dataset.
If :obj:`"test"`, loads the test dataset.
(default: :obj:`"trainval"`)
transform (callable, optional): A function/transform that takes in an
:obj:`torch_geometric.data.Data` object and returns a transformed
version. The data object will be transformed before every access.
(default: :obj:`None`)
pre_transform (callable, optional): A function/transform that takes in
an :obj:`torch_geometric.data.Data` object and returns a
transformed version. The data object will be transformed before
being saved to disk. (default: :obj:`None`)
pre_filter (callable, optional): A function that takes in an
:obj:`torch_geometric.data.Data` object and returns a boolean
value, indicating whether the data object should be included in the
final dataset. (default: :obj:`None`)
force_reload (bool, optional): Whether to re-process the dataset.
(default: :obj:`False`)
**STATS:**
.. list-table::
:widths: 10 10 10 10 10
:header-rows: 1
* - #graphs
- #nodes
- #edges
- #features
- #classes
* - 16,881
- ~2,616.2
- 0
- 3
- 50
"""
url = ('https://shapenet.cs.stanford.edu/media/'
'shapenetcore_partanno_segmentation_benchmark_v0_normal.zip')
# In case `shapenet.cs.stanford.edu` is offline, try to download the data
# from Kaggle instead (requires login):
# https://www.kaggle.com/datasets/mitkir/shapenet/download?datasetVersionNumber=1
category_ids = {
'Airplane': '02691156',
'Bag': '02773838',
'Cap': '02954340',
'Car': '02958343',
'Chair': '03001627',
'Earphone': '03261776',
'Guitar': '03467517',
'Knife': '03624134',
'Lamp': '03636649',
'Laptop': '03642806',
'Motorbike': '03790512',
'Mug': '03797390',
'Pistol': '03948459',
'Rocket': '04099429',
'Skateboard': '04225987',
'Table': '04379243',
}
seg_classes = {
'Airplane': [0, 1, 2, 3],
'Bag': [4, 5],
'Cap': [6, 7],
'Car': [8, 9, 10, 11],
'Chair': [12, 13, 14, 15],
'Earphone': [16, 17, 18],
'Guitar': [19, 20, 21],
'Knife': [22, 23],
'Lamp': [24, 25, 26, 27],
'Laptop': [28, 29],
'Motorbike': [30, 31, 32, 33, 34, 35],
'Mug': [36, 37],
'Pistol': [38, 39, 40],
'Rocket': [41, 42, 43],
'Skateboard': [44, 45, 46],
'Table': [47, 48, 49],
}
def __init__(
self,
root: str,
categories: Optional[Union[str, List[str]]] = None,
include_normals: bool = True,
split: str = 'trainval',
transform: Optional[Callable] = None,
pre_transform: Optional[Callable] = None,
pre_filter: Optional[Callable] = None,
force_reload: bool = False,
) -> None:
if categories is None:
categories = list(self.category_ids.keys())
if isinstance(categories, str):
categories = [categories]
assert all(category in self.category_ids for category in categories)
self.categories = categories
super().__init__(root, transform, pre_transform, pre_filter,
force_reload=force_reload)
if split == 'train':
path = self.processed_paths[0]
elif split == 'val':
path = self.processed_paths[1]
elif split == 'test':
path = self.processed_paths[2]
elif split == 'trainval':
path = self.processed_paths[3]
else:
raise ValueError(f'Split {split} found, but expected either '
'train, val, trainval or test')
self.load(path)
assert isinstance(self._data, Data)
self._data.x = self._data.x if include_normals else None
self.y_mask = torch.zeros((len(self.seg_classes.keys()), 50),
dtype=torch.bool)
for i, labels in enumerate(self.seg_classes.values()):
self.y_mask[i, labels] = 1
@property
def num_classes(self) -> int:
return self.y_mask.size(-1)
@property
def raw_file_names(self) -> List[str]:
return list(self.category_ids.values()) + ['train_test_split']
@property
def processed_file_names(self) -> List[str]:
cats = '_'.join([cat[:3].lower() for cat in self.categories])
return [
osp.join(f'{cats}_{split}.pt')
for split in ['train', 'val', 'test', 'trainval']
]
def download(self) -> None:
path = download_url(self.url, self.root)
extract_zip(path, self.root)
os.unlink(path)
fs.rm(self.raw_dir)
name = self.url.split('/')[-1].split('.')[0]
os.rename(osp.join(self.root, name), self.raw_dir)
def process_filenames(self, filenames: List[str]) -> List[Data]:
data_list = []
categories_ids = [self.category_ids[cat] for cat in self.categories]
cat_idx = {categories_ids[i]: i for i in range(len(categories_ids))}
for name in filenames:
cat = name.split(osp.sep)[0]
if cat not in categories_ids:
continue
tensor = read_txt_array(osp.join(self.raw_dir, name))
pos = tensor[:, :3]
x = tensor[:, 3:6]
y = tensor[:, -1].type(torch.long)
data = Data(pos=pos, x=x, y=y, category=cat_idx[cat])
if self.pre_filter is not None and not self.pre_filter(data):
continue
if self.pre_transform is not None:
data = self.pre_transform(data)
data_list.append(data)
return data_list
def process(self) -> None:
trainval = []
for i, split in enumerate(['train', 'val', 'test']):
path = osp.join(self.raw_dir, 'train_test_split',
f'shuffled_{split}_file_list.json')
with open(path) as f:
filenames = [
osp.sep.join(name.split('/')[1:]) + '.txt'
for name in json.load(f)
] # Removing first directory.
data_list = self.process_filenames(filenames)
if split == 'train' or split == 'val':
trainval += data_list
self.save(data_list, self.processed_paths[i])
self.save(trainval, self.processed_paths[3])
def __repr__(self) -> str:
return (f'{self.__class__.__name__}({len(self)}, '
f'categories={self.categories})')