You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

312 lines
13 KiB

# Ultralytics YOLO 🚀, AGPL-3.0 license
import math
from copy import deepcopy
from itertools import product
from typing import Any, Dict, Generator, ItemsView, List, Tuple
import numpy as np
import torch
class MaskData:
"""
A structure for storing masks and their related data in batched format.
Implements basic filtering and concatenation.
"""
def __init__(self, **kwargs) -> None:
"""Initialize a MaskData object, ensuring all values are supported types."""
for v in kwargs.values():
assert isinstance(
v, (list, np.ndarray, torch.Tensor)), 'MaskData only supports list, numpy arrays, and torch tensors.'
self._stats = dict(**kwargs)
def __setitem__(self, key: str, item: Any) -> None:
"""Set an item in the MaskData object, ensuring it is a supported type."""
assert isinstance(
item, (list, np.ndarray, torch.Tensor)), 'MaskData only supports list, numpy arrays, and torch tensors.'
self._stats[key] = item
def __delitem__(self, key: str) -> None:
"""Delete an item from the MaskData object."""
del self._stats[key]
def __getitem__(self, key: str) -> Any:
"""Get an item from the MaskData object."""
return self._stats[key]
def items(self) -> ItemsView[str, Any]:
"""Return an ItemsView of the MaskData object."""
return self._stats.items()
def filter(self, keep: torch.Tensor) -> None:
"""Filter the MaskData object based on the given boolean tensor."""
for k, v in self._stats.items():
if v is None:
self._stats[k] = None
elif isinstance(v, torch.Tensor):
self._stats[k] = v[torch.as_tensor(keep, device=v.device)]
elif isinstance(v, np.ndarray):
self._stats[k] = v[keep.detach().cpu().numpy()]
elif isinstance(v, list) and keep.dtype == torch.bool:
self._stats[k] = [a for i, a in enumerate(v) if keep[i]]
elif isinstance(v, list):
self._stats[k] = [v[i] for i in keep]
else:
raise TypeError(f'MaskData key {k} has an unsupported type {type(v)}.')
def cat(self, new_stats: 'MaskData') -> None:
"""Concatenate a new MaskData object to the current one."""
for k, v in new_stats.items():
if k not in self._stats or self._stats[k] is None:
self._stats[k] = deepcopy(v)
elif isinstance(v, torch.Tensor):
self._stats[k] = torch.cat([self._stats[k], v], dim=0)
elif isinstance(v, np.ndarray):
self._stats[k] = np.concatenate([self._stats[k], v], axis=0)
elif isinstance(v, list):
self._stats[k] = self._stats[k] + deepcopy(v)
else:
raise TypeError(f'MaskData key {k} has an unsupported type {type(v)}.')
def to_numpy(self) -> None:
"""Convert all torch tensors in the MaskData object to numpy arrays."""
for k, v in self._stats.items():
if isinstance(v, torch.Tensor):
self._stats[k] = v.detach().cpu().numpy()
def is_box_near_crop_edge(boxes: torch.Tensor,
crop_box: List[int],
orig_box: List[int],
atol: float = 20.0) -> torch.Tensor:
"""Return a boolean tensor indicating if boxes are near the crop edge."""
crop_box_torch = torch.as_tensor(crop_box, dtype=torch.float, device=boxes.device)
orig_box_torch = torch.as_tensor(orig_box, dtype=torch.float, device=boxes.device)
boxes = uncrop_boxes_xyxy(boxes, crop_box).float()
near_crop_edge = torch.isclose(boxes, crop_box_torch[None, :], atol=atol, rtol=0)
near_image_edge = torch.isclose(boxes, orig_box_torch[None, :], atol=atol, rtol=0)
near_crop_edge = torch.logical_and(near_crop_edge, ~near_image_edge)
return torch.any(near_crop_edge, dim=1)
def box_xyxy_to_xywh(box_xyxy: torch.Tensor) -> torch.Tensor:
"""Convert bounding boxes from XYXY format to XYWH format."""
box_xywh = deepcopy(box_xyxy)
box_xywh[2] = box_xywh[2] - box_xywh[0]
box_xywh[3] = box_xywh[3] - box_xywh[1]
return box_xywh
def batch_iterator(batch_size: int, *args) -> Generator[List[Any], None, None]:
"""Yield batches of data from the input arguments."""
assert args and all(len(a) == len(args[0]) for a in args), 'Batched iteration must have same-size inputs.'
n_batches = len(args[0]) // batch_size + int(len(args[0]) % batch_size != 0)
for b in range(n_batches):
yield [arg[b * batch_size:(b + 1) * batch_size] for arg in args]
def mask_to_rle_pytorch(tensor: torch.Tensor) -> List[Dict[str, Any]]:
"""Encode masks as uncompressed RLEs in the format expected by pycocotools."""
# Put in fortran order and flatten h,w
b, h, w = tensor.shape
tensor = tensor.permute(0, 2, 1).flatten(1)
# Compute change indices
diff = tensor[:, 1:] ^ tensor[:, :-1]
change_indices = diff.nonzero()
# Encode run length
out = []
for i in range(b):
cur_idxs = change_indices[change_indices[:, 0] == i, 1]
cur_idxs = torch.cat([
torch.tensor([0], dtype=cur_idxs.dtype, device=cur_idxs.device),
cur_idxs + 1,
torch.tensor([h * w], dtype=cur_idxs.dtype, device=cur_idxs.device), ])
btw_idxs = cur_idxs[1:] - cur_idxs[:-1]
counts = [] if tensor[i, 0] == 0 else [0]
counts.extend(btw_idxs.detach().cpu().tolist())
out.append({'size': [h, w], 'counts': counts})
return out
def rle_to_mask(rle: Dict[str, Any]) -> np.ndarray:
"""Compute a binary mask from an uncompressed RLE."""
h, w = rle['size']
mask = np.empty(h * w, dtype=bool)
idx = 0
parity = False
for count in rle['counts']:
mask[idx:idx + count] = parity
idx += count
parity ^= True
mask = mask.reshape(w, h)
return mask.transpose() # Put in C order
def area_from_rle(rle: Dict[str, Any]) -> int:
"""Calculate the area of a mask from its uncompressed RLE."""
return sum(rle['counts'][1::2])
def calculate_stability_score(masks: torch.Tensor, mask_threshold: float, threshold_offset: float) -> torch.Tensor:
"""
Computes the stability score for a batch of masks. The stability
score is the IoU between the binary masks obtained by thresholding
the predicted mask logits at high and low values.
"""
# One mask is always contained inside the other.
# Save memory by preventing unnecessary cast to torch.int64
intersections = ((masks > (mask_threshold + threshold_offset)).sum(-1, dtype=torch.int16).sum(-1,
dtype=torch.int32))
unions = ((masks > (mask_threshold - threshold_offset)).sum(-1, dtype=torch.int16).sum(-1, dtype=torch.int32))
return intersections / unions
def build_point_grid(n_per_side: int) -> np.ndarray:
"""Generate a 2D grid of evenly spaced points in the range [0,1]x[0,1]."""
offset = 1 / (2 * n_per_side)
points_one_side = np.linspace(offset, 1 - offset, n_per_side)
points_x = np.tile(points_one_side[None, :], (n_per_side, 1))
points_y = np.tile(points_one_side[:, None], (1, n_per_side))
return np.stack([points_x, points_y], axis=-1).reshape(-1, 2)
def build_all_layer_point_grids(n_per_side: int, n_layers: int, scale_per_layer: int) -> List[np.ndarray]:
"""Generate point grids for all crop layers."""
return [build_point_grid(int(n_per_side / (scale_per_layer ** i))) for i in range(n_layers + 1)]
def generate_crop_boxes(im_size: Tuple[int, ...], n_layers: int,
overlap_ratio: float) -> Tuple[List[List[int]], List[int]]:
"""Generates a list of crop boxes of different sizes. Each layer has (2**i)**2 boxes for the ith layer."""
crop_boxes, layer_idxs = [], []
im_h, im_w = im_size
short_side = min(im_h, im_w)
# Original image
crop_boxes.append([0, 0, im_w, im_h])
layer_idxs.append(0)
def crop_len(orig_len, n_crops, overlap):
"""Crops bounding boxes to the size of the input image."""
return int(math.ceil((overlap * (n_crops - 1) + orig_len) / n_crops))
for i_layer in range(n_layers):
n_crops_per_side = 2 ** (i_layer + 1)
overlap = int(overlap_ratio * short_side * (2 / n_crops_per_side))
crop_w = crop_len(im_w, n_crops_per_side, overlap)
crop_h = crop_len(im_h, n_crops_per_side, overlap)
crop_box_x0 = [int((crop_w - overlap) * i) for i in range(n_crops_per_side)]
crop_box_y0 = [int((crop_h - overlap) * i) for i in range(n_crops_per_side)]
# Crops in XYWH format
for x0, y0 in product(crop_box_x0, crop_box_y0):
box = [x0, y0, min(x0 + crop_w, im_w), min(y0 + crop_h, im_h)]
crop_boxes.append(box)
layer_idxs.append(i_layer + 1)
return crop_boxes, layer_idxs
def uncrop_boxes_xyxy(boxes: torch.Tensor, crop_box: List[int]) -> torch.Tensor:
"""Uncrop bounding boxes by adding the crop box offset."""
x0, y0, _, _ = crop_box
offset = torch.tensor([[x0, y0, x0, y0]], device=boxes.device)
# Check if boxes has a channel dimension
if len(boxes.shape) == 3:
offset = offset.unsqueeze(1)
return boxes + offset
def uncrop_points(points: torch.Tensor, crop_box: List[int]) -> torch.Tensor:
"""Uncrop points by adding the crop box offset."""
x0, y0, _, _ = crop_box
offset = torch.tensor([[x0, y0]], device=points.device)
# Check if points has a channel dimension
if len(points.shape) == 3:
offset = offset.unsqueeze(1)
return points + offset
def uncrop_masks(masks: torch.Tensor, crop_box: List[int], orig_h: int, orig_w: int) -> torch.Tensor:
"""Uncrop masks by padding them to the original image size."""
x0, y0, x1, y1 = crop_box
if x0 == 0 and y0 == 0 and x1 == orig_w and y1 == orig_h:
return masks
# Coordinate transform masks
pad_x, pad_y = orig_w - (x1 - x0), orig_h - (y1 - y0)
pad = (x0, pad_x - x0, y0, pad_y - y0)
return torch.nn.functional.pad(masks, pad, value=0)
def remove_small_regions(mask: np.ndarray, area_thresh: float, mode: str) -> Tuple[np.ndarray, bool]:
"""Remove small disconnected regions or holes in a mask, returning the mask and a modification indicator."""
import cv2 # type: ignore
assert mode in {'holes', 'islands'}
correct_holes = mode == 'holes'
working_mask = (correct_holes ^ mask).astype(np.uint8)
n_labels, regions, stats, _ = cv2.connectedComponentsWithStats(working_mask, 8)
sizes = stats[:, -1][1:] # Row 0 is background label
small_regions = [i + 1 for i, s in enumerate(sizes) if s < area_thresh]
if not small_regions:
return mask, False
fill_labels = [0] + small_regions
if not correct_holes:
# If every region is below threshold, keep largest
fill_labels = [i for i in range(n_labels) if i not in fill_labels] or [int(np.argmax(sizes)) + 1]
mask = np.isin(regions, fill_labels)
return mask, True
def coco_encode_rle(uncompressed_rle: Dict[str, Any]) -> Dict[str, Any]:
"""Encode uncompressed RLE (run-length encoding) to COCO RLE format."""
from pycocotools import mask as mask_utils # type: ignore
h, w = uncompressed_rle['size']
rle = mask_utils.frPyObjects(uncompressed_rle, h, w)
rle['counts'] = rle['counts'].decode('utf-8') # Necessary to serialize with json
return rle
def batched_mask_to_box(masks: torch.Tensor) -> torch.Tensor:
"""
Calculates boxes in XYXY format around masks. Return [0,0,0,0] for
an empty mask. For input shape C1xC2x...xHxW, the output shape is C1xC2x...x4.
"""
# torch.max below raises an error on empty inputs, just skip in this case
if torch.numel(masks) == 0:
return torch.zeros(*masks.shape[:-2], 4, device=masks.device)
# Normalize shape to CxHxW
shape = masks.shape
h, w = shape[-2:]
masks = masks.flatten(0, -3) if len(shape) > 2 else masks.unsqueeze(0)
# Get top and bottom edges
in_height, _ = torch.max(masks, dim=-1)
in_height_coords = in_height * torch.arange(h, device=in_height.device)[None, :]
bottom_edges, _ = torch.max(in_height_coords, dim=-1)
in_height_coords = in_height_coords + h * (~in_height)
top_edges, _ = torch.min(in_height_coords, dim=-1)
# Get left and right edges
in_width, _ = torch.max(masks, dim=-2)
in_width_coords = in_width * torch.arange(w, device=in_width.device)[None, :]
right_edges, _ = torch.max(in_width_coords, dim=-1)
in_width_coords = in_width_coords + w * (~in_width)
left_edges, _ = torch.min(in_width_coords, dim=-1)
# If the mask is empty the right edge will be to the left of the left edge.
# Replace these boxes with [0, 0, 0, 0]
empty_filter = (right_edges < left_edges) | (bottom_edges < top_edges)
out = torch.stack([left_edges, top_edges, right_edges, bottom_edges], dim=-1)
out = out * (~empty_filter).unsqueeze(-1)
# Return to original shape
return out.reshape(*shape[:-2], 4) if len(shape) > 2 else out[0]