Source code for torch_geometric.transforms.random_rotate

import numbers
import random
import math

import torch
from torch_geometric.transforms import LinearTransformation


[docs]class RandomRotate(object): r"""Rotates node positions around a specific axis by a randomly sampled factor within a given interval. Args: degrees (tuple or float): Rotation interval from which the rotation angle is sampled. If :obj:`degrees` is a number instead of a tuple, the interval is given by :math:`[-\mathrm{degrees}, \mathrm{degrees}]`. axis (int, optional): The rotation axis. (default: :obj:`0`) """ def __init__(self, degrees, axis=0): if isinstance(degrees, numbers.Number): degrees = (-abs(degrees), abs(degrees)) assert isinstance(degrees, (tuple, list)) and len(degrees) == 2 self.degrees = degrees self.axis = axis def __call__(self, data): degree = math.pi * random.uniform(*self.degrees) / 180.0 sin, cos = math.sin(degree), math.cos(degree) if data.pos.size(-1) == 2: matrix = [[cos, sin], [-sin, cos]] else: if self.axis == 0: matrix = [[1, 0, 0], [0, cos, sin], [0, -sin, cos]] elif self.axis == 1: matrix = [[cos, 0, -sin], [0, 1, 0], [sin, 0, cos]] else: matrix = [[cos, sin, 0], [-sin, cos, 0], [0, 0, 1]] return LinearTransformation(torch.tensor(matrix))(data) def __repr__(self): return '{}({}, axis={})'.format(self.__class__.__name__, self.degrees, self.axis)