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Si11ium
158
dataset/shapenet.py
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158
dataset/shapenet.py
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import os
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import numpy as np
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from torch.utils.data import Dataset
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from torch_geometric.datasets import ShapeNet
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from itertools import repeat, product
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from collections import defaultdict
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import os
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from tqdm import tqdm
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import os.path as osp
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import glob
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import torch
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from torch_geometric.data import (Data, InMemoryDataset, download_url,
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extract_zip)
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from torch.utils.data import Dataset
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from torch_geometric.read import read_txt_array
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from torch_geometric.datasets import ShapeNet
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from torch_geometric.read import parse_txt_array
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class CustomShapeNet(InMemoryDataset):
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categories = {key: val for val, key in enumerate(['Box', 'Cone', 'Cylinder', 'Sphere'])}
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def __init__(self, root, train=True, transform=None, pre_filter=None, pre_transform=None, **kwargs):
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super(CustomShapeNet, self).__init__(root, transform, pre_transform, pre_filter)
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path = self.processed_paths[0] if train else self.processed_paths[1]
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self.data, self.slices = torch.load(path)
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print("Initialized")
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@property
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def raw_file_names(self):
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# Maybe add more data like validation sets
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return ['train', 'test']
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@property
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def processed_file_names(self):
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return [f'{x}.pt' for x in self.raw_file_names]
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def download(self):
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dir_count = len([name for name in os.listdir(self.raw_dir) if os.path.isdir(os.path.join(self.raw_dir, name))])
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print(f'{dir_count} folders have been found....')
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if dir_count:
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return dir_count
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raise IOError("No raw pointclouds have been found.")
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@property
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def num_classes(self):
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return len(self.categories)
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def _load_dataset(self):
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data, slices = None, None
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while True:
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try:
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filepath = os.path.join(self.root, self.processed_dir, f'{"train" if self.train else "test"}.pt')
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data, slices = torch.load(filepath)
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print('Dataset Loaded')
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break
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except FileNotFoundError:
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self.process()
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continue
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return data, slices
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def process(self, delimiter=' '):
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# idx = self.categories[self.category]
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# paths = [osp.join(path, idx) for path in self.raw_paths]
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datasets = defaultdict(list)
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for idx, setting in enumerate(self.raw_file_names):
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for pointcloud in tqdm(os.scandir(os.path.join(self.raw_dir, setting))):
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if not os.path.isdir(pointcloud):
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continue
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for element in glob.glob(os.path.join(pointcloud.path, '*.dat')):
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if os.path.split(element)[-1] not in ['pc.dat']:
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# Assign training data to the data container
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# Following the original logic;
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# y should be the label;
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# pos should be the six dimensional vector describing: !its pos not points!!
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# x,y,z,x_rot,y_rot,z_rot
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y_raw = os.path.splitext(element)[0].split('_')[-2]
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with open(element,'r') as f:
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headers = f.__next__()
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# Check if there are no useable nodes in this file, header says 0.
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if not int(headers.rstrip().split(delimiter)[0]):
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continue
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# Get the y - Label
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# Iterate over all rows
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src = [[float(x) if x not in ['-nan(ind)', 'nan(ind)'] else 0
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for x in line.rstrip().split(delimiter)[None:None]] for line in f if line != '']
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points = torch.tensor(src, dtype=None).squeeze()
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if not len(points.shape) > 1:
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continue
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# pos = points[:, :3]
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# norm = points[:, 3:]
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y_all = [self.categories[y_raw]] * points.shape[0]
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y = torch.as_tensor(y_all, dtype=torch.int)
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# points = torch.as_tensor(points, dtype=torch.float)
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# norm = torch.as_tensor(norm, dtype=torch.float)
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data = Data(y=y, pos=points[:, :3])
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# , points=points, norm=points[:3], )
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# ToDo: ANy filter to apply? Then do it here.
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if self.pre_filter is not None and not self.pre_filter(data):
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data = self.pre_filter(data)
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raise NotImplementedError
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# ToDo: ANy transformation to apply? Then do it here.
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if self.pre_transform is not None:
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data = self.pre_transform(data)
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raise NotImplementedError
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datasets[setting].append(data)
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os.makedirs(self.processed_dir, exist_ok=True)
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torch.save(self.collate(datasets[setting]), self.processed_paths[idx])
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def __repr__(self):
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return f'{self.__class__.__name__}({len(self)})'
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class ShapeNetPartSegDataset(Dataset):
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"""
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Resample raw point cloud to fixed number of points.
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Map raw label from range [1, N] to [0, N-1].
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"""
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def __init__(self, root_dir, train=True, transform=None, npoints=1024):
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super(ShapeNetPartSegDataset, self).__init__()
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self.npoints = npoints
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self.dataset = CustomShapeNet(root=root_dir, train=train, transform=transform)
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def __getitem__(self, index):
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data = self.dataset[index]
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points, labels = data.pos, data.y
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# Resample to fixed number of points
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try:
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choice = np.random.choice(points.shape[0], self.npoints, replace=True)
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except ValueError:
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choice = []
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points, labels = points[choice, :], labels[choice]
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labels -= 1 if self.num_classes() in labels else 0 # Map label from [1, C] to [0, C-1]
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sample = {
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'points': points, # torch.Tensor (n, 3)
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'labels': labels # torch.Tensor (n,)
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}
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return sample
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def __len__(self):
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return len(self.dataset)
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def num_classes(self):
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return self.dataset.num_classes
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