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import math |
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import random |
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import warnings |
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from itertools import cycle |
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from typing import List, Optional, Tuple, Callable |
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from PIL import Image as pil_image, ImageDraw as pil_img_draw, ImageFont |
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from more_itertools.recipes import grouper |
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from taming.data.conditional_builder.utils import COLOR_PALETTE, WHITE, GRAY_75, BLACK, FULL_CROP, filter_annotations, \ |
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additional_parameters_string, horizontally_flip_bbox, pad_list, get_circle_size, get_plot_font_size, \ |
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absolute_bbox, rescale_annotations |
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from taming.data.helper_types import BoundingBox, Annotation |
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from taming.data.image_transforms import convert_pil_to_tensor |
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from torch import LongTensor, Tensor |
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class ObjectsCenterPointsConditionalBuilder: |
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def __init__(self, no_object_classes: int, no_max_objects: int, no_tokens: int, encode_crop: bool, |
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use_group_parameter: bool, use_additional_parameters: bool): |
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self.no_object_classes = no_object_classes |
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self.no_max_objects = no_max_objects |
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self.no_tokens = no_tokens |
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self.encode_crop = encode_crop |
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self.no_sections = int(math.sqrt(self.no_tokens)) |
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self.use_group_parameter = use_group_parameter |
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self.use_additional_parameters = use_additional_parameters |
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@property |
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def none(self) -> int: |
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return self.no_tokens - 1 |
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@property |
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def object_descriptor_length(self) -> int: |
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return 2 |
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@property |
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def embedding_dim(self) -> int: |
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extra_length = 2 if self.encode_crop else 0 |
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return self.no_max_objects * self.object_descriptor_length + extra_length |
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def tokenize_coordinates(self, x: float, y: float) -> int: |
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""" |
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Express 2d coordinates with one number. |
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Example: assume self.no_tokens = 16, then no_sections = 4: |
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0 0 0 0 |
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0 0 # 0 |
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0 0 0 0 |
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0 0 0 x |
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Then the # position corresponds to token 6, the x position to token 15. |
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@param x: float in [0, 1] |
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@param y: float in [0, 1] |
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@return: discrete tokenized coordinate |
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""" |
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x_discrete = int(round(x * (self.no_sections - 1))) |
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y_discrete = int(round(y * (self.no_sections - 1))) |
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return y_discrete * self.no_sections + x_discrete |
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def coordinates_from_token(self, token: int) -> (float, float): |
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x = token % self.no_sections |
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y = token // self.no_sections |
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return x / (self.no_sections - 1), y / (self.no_sections - 1) |
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def bbox_from_token_pair(self, token1: int, token2: int) -> BoundingBox: |
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x0, y0 = self.coordinates_from_token(token1) |
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x1, y1 = self.coordinates_from_token(token2) |
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return x0, y0, x1 - x0, y1 - y0 |
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def token_pair_from_bbox(self, bbox: BoundingBox) -> Tuple[int, int]: |
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return self.tokenize_coordinates(bbox[0], bbox[1]), \ |
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self.tokenize_coordinates(bbox[0] + bbox[2], bbox[1] + bbox[3]) |
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def inverse_build(self, conditional: LongTensor) \ |
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-> Tuple[List[Tuple[int, Tuple[float, float]]], Optional[BoundingBox]]: |
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conditional_list = conditional.tolist() |
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crop_coordinates = None |
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if self.encode_crop: |
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crop_coordinates = self.bbox_from_token_pair(conditional_list[-2], conditional_list[-1]) |
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conditional_list = conditional_list[:-2] |
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table_of_content = grouper(conditional_list, self.object_descriptor_length) |
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assert conditional.shape[0] == self.embedding_dim |
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return [ |
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(object_tuple[0], self.coordinates_from_token(object_tuple[1])) |
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for object_tuple in table_of_content if object_tuple[0] != self.none |
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], crop_coordinates |
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def plot(self, conditional: LongTensor, label_for_category_no: Callable[[int], str], figure_size: Tuple[int, int], |
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line_width: int = 3, font_size: Optional[int] = None) -> Tensor: |
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plot = pil_image.new('RGB', figure_size, WHITE) |
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draw = pil_img_draw.Draw(plot) |
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circle_size = get_circle_size(figure_size) |
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font = ImageFont.truetype('/usr/share/fonts/truetype/lato/Lato-Regular.ttf', |
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size=get_plot_font_size(font_size, figure_size)) |
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width, height = plot.size |
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description, crop_coordinates = self.inverse_build(conditional) |
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for (representation, (x, y)), color in zip(description, cycle(COLOR_PALETTE)): |
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x_abs, y_abs = x * width, y * height |
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ann = self.representation_to_annotation(representation) |
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label = label_for_category_no(ann.category_no) + ' ' + additional_parameters_string(ann) |
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ellipse_bbox = [x_abs - circle_size, y_abs - circle_size, x_abs + circle_size, y_abs + circle_size] |
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draw.ellipse(ellipse_bbox, fill=color, width=0) |
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draw.text((x_abs, y_abs), label, anchor='md', fill=BLACK, font=font) |
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if crop_coordinates is not None: |
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draw.rectangle(absolute_bbox(crop_coordinates, width, height), outline=GRAY_75, width=line_width) |
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return convert_pil_to_tensor(plot) / 127.5 - 1. |
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def object_representation(self, annotation: Annotation) -> int: |
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modifier = 0 |
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if self.use_group_parameter: |
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modifier |= 1 * (annotation.is_group_of is True) |
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if self.use_additional_parameters: |
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modifier |= 2 * (annotation.is_occluded is True) |
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modifier |= 4 * (annotation.is_depiction is True) |
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modifier |= 8 * (annotation.is_inside is True) |
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return annotation.category_no + self.no_object_classes * modifier |
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def representation_to_annotation(self, representation: int) -> Annotation: |
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category_no = representation % self.no_object_classes |
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modifier = representation // self.no_object_classes |
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return Annotation( |
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area=None, image_id=None, bbox=None, category_id=None, id=None, source=None, confidence=None, |
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category_no=category_no, |
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is_group_of=bool((modifier & 1) * self.use_group_parameter), |
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is_occluded=bool((modifier & 2) * self.use_additional_parameters), |
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is_depiction=bool((modifier & 4) * self.use_additional_parameters), |
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is_inside=bool((modifier & 8) * self.use_additional_parameters) |
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) |
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def _crop_encoder(self, crop_coordinates: BoundingBox) -> List[int]: |
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return list(self.token_pair_from_bbox(crop_coordinates)) |
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def _make_object_descriptors(self, annotations: List[Annotation]) -> List[Tuple[int, ...]]: |
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object_tuples = [ |
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(self.object_representation(a), |
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self.tokenize_coordinates(a.bbox[0] + a.bbox[2] / 2, a.bbox[1] + a.bbox[3] / 2)) |
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for a in annotations |
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] |
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empty_tuple = (self.none, self.none) |
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object_tuples = pad_list(object_tuples, empty_tuple, self.no_max_objects) |
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return object_tuples |
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def build(self, annotations: List, crop_coordinates: Optional[BoundingBox] = None, horizontal_flip: bool = False) \ |
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-> LongTensor: |
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if len(annotations) == 0: |
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warnings.warn('Did not receive any annotations.') |
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if len(annotations) > self.no_max_objects: |
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warnings.warn('Received more annotations than allowed.') |
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annotations = annotations[:self.no_max_objects] |
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if not crop_coordinates: |
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crop_coordinates = FULL_CROP |
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random.shuffle(annotations) |
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annotations = filter_annotations(annotations, crop_coordinates) |
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if self.encode_crop: |
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annotations = rescale_annotations(annotations, FULL_CROP, horizontal_flip) |
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if horizontal_flip: |
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crop_coordinates = horizontally_flip_bbox(crop_coordinates) |
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extra = self._crop_encoder(crop_coordinates) |
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else: |
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annotations = rescale_annotations(annotations, crop_coordinates, horizontal_flip) |
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extra = [] |
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object_tuples = self._make_object_descriptors(annotations) |
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flattened = [token for tuple_ in object_tuples for token in tuple_] + extra |
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assert len(flattened) == self.embedding_dim |
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assert all(0 <= value < self.no_tokens for value in flattened) |
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return LongTensor(flattened) |
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