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# -*- coding: utf-8 -*-
# CellViT Inference Method for Patch-Wise Inference on a test set
# Without merging WSI
#
# Aim is to calculate metrics as defined for the PanNuke dataset
#
# @ Fabian Hörst, [email protected]
# Institute for Artifical Intelligence in Medicine,
# University Medicine Essen
import argparse
import inspect
import os
import sys
currentdir = os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe())))
parentdir = os.path.dirname(currentdir)
sys.path.insert(0, parentdir)
parentdir = os.path.dirname(parentdir)
sys.path.insert(0, parentdir)
from base_ml.base_experiment import BaseExperiment
BaseExperiment.seed_run(1232)
import json
from pathlib import Path
from typing import List, Tuple, Union
import albumentations as A
import numpy as np
import torch
import torch.nn.functional as F
import tqdm
import yaml
from matplotlib import pyplot as plt
from PIL import Image, ImageDraw
from skimage.color import rgba2rgb
from sklearn.metrics import accuracy_score
from tabulate import tabulate
from torch.utils.data import DataLoader
from torchmetrics.functional import dice
from torchmetrics.functional.classification import binary_jaccard_index
from torchvision import transforms
from cell_segmentation.datasets.dataset_coordinator import select_dataset
from models.segmentation.cell_segmentation.cellvit import DataclassHVStorage
from cell_segmentation.utils.metrics import (
cell_detection_scores,
cell_type_detection_scores,
get_fast_pq,
remap_label,
binarize,
)
from cell_segmentation.utils.post_proc_cellvit import calculate_instances
from cell_segmentation.utils.tools import cropping_center, pair_coordinates
from models.segmentation.cell_segmentation.cellvit import CellViT
from utils.logger import Logger
class InferenceCellViT:
def __init__(
self,
run_dir: Union[Path, str],
gpu: int,
magnification: int = 40,
checkpoint_name: str = "model_best.pth",
) -> None:
"""Inference for HoverNet
Args:
run_dir (Union[Path, str]): logging directory with checkpoints and configs
gpu (int): CUDA GPU device to use for inference
magnification (int, optional): Dataset magnification. Defaults to 40.
checkpoint_name (str, optional): Select name of the model to load. Defaults to model_best.pth
"""
self.run_dir = Path(run_dir)
self.device = "cpu"
self.run_conf: dict = None
self.logger: Logger = None
self.magnification = magnification
self.checkpoint_name = checkpoint_name
self.__load_run_conf()
# self.__instantiate_logger()
self.__setup_amp()
self.num_classes = self.run_conf["data"]["num_nuclei_classes"]
def __load_run_conf(self) -> None:
"""Load the config.yaml file with the run setup
Be careful with loading and usage, since original None values in the run configuration are not stored when dumped to yaml file.
If you want to check if a key is not defined, first check if the key does exists in the dict.
"""
with open((self.run_dir / "config.yaml").resolve(), "r") as run_config_file:
yaml_config = yaml.safe_load(run_config_file)
self.run_conf = dict(yaml_config)
def __load_dataset_setup(self, dataset_path: Union[Path, str]) -> None:
"""Load the configuration of the cell segmentation dataset.
The dataset must have a dataset_config.yaml file in their dataset path with the following entries:
* tissue_types: describing the present tissue types with corresponding integer
* nuclei_types: describing the present nuclei types with corresponding integer
Args:
dataset_path (Union[Path, str]): Path to dataset folder
"""
dataset_config_path = Path(dataset_path) / "dataset_config.yaml"
with open(dataset_config_path, "r") as dataset_config_file:
yaml_config = yaml.safe_load(dataset_config_file)
self.dataset_config = dict(yaml_config)
def __instantiate_logger(self) -> None:
"""Instantiate logger
Logger is using no formatters. Logs are stored in the run directory under the filename: inference.log
"""
logger = Logger(
level=self.run_conf["logging"]["level"].upper(),
log_dir=Path(self.run_dir).resolve(),
comment="inference",
use_timestamp=False,
formatter="%(message)s",
)
self.logger = logger.create_logger()
def __check_eval_model(self) -> None:
"""Check if there is a best model pytorch file"""
assert (self.run_dir / "checkpoints" / self.checkpoint_name).is_file()
def __setup_amp(self) -> None:
"""Setup automated mixed precision (amp) for inference."""
self.mixed_precision = self.run_conf["training"].get("mixed_precision", False)
def get_model(
self, model_type: str
) -> CellViT:
"""Return the trained model for inference
Args:
model_type (str): Name of the model. Must either be one of:
CellViT, CellViTShared, CellViT256, CellViT256Shared, CellViTSAM, CellViTSAMShared
Returns:
Union[CellViT, CellViTShared, CellViT256, CellViT256Shared, CellViTSAM, CellViTSAMShared]: Model
"""
implemented_models = [
"CellViT",
]
if model_type not in implemented_models:
raise NotImplementedError(
f"Unknown model type. Please select one of {implemented_models}"
)
if model_type in ["CellViT", "CellViTShared"]:
if model_type == "CellViT":
model_class = CellViT
model = model_class(
model256_path=self.run_conf["model"].get("pretrained_encoder"),
num_nuclei_classes=self.run_conf["data"]["num_nuclei_classes"],
num_tissue_classes=self.run_conf["data"]["num_tissue_classes"],
#embed_dim=self.run_conf["model"]["embed_dim"],
in_channels=self.run_conf["model"].get("input_chanels", 3),
#embed_dim=self.run_conf["model"]["embed_dim"],
#input_channels=self.run_conf["model"].get("input_channels", 3),
#depth=self.run_conf["model"]["depth"],
#num_heads=self.run_conf["model"]["num_heads"],
#extract_layers=self.run_conf["model"]["extract_layers"],
#regression_loss=self.run_conf["model"].get("regression_loss", False),
)
return model
def setup_patch_inference(
self, test_folds: List[int] = None
) -> Tuple[
CellViT,
DataLoader,
dict,
]:
"""Setup patch inference by defining a patch-wise datalaoder and loading the model checkpoint
Args:
test_folds (List[int], optional): Test fold to use. Otherwise defined folds from config.yaml (in run_dir) are loaded. Defaults to None.
Returns:
tuple[Union[CellViT, CellViTShared, CellViT256, CellViT256Shared, CellViTSAM, CellViTSAMShared], DataLoader, dict]:
Union[CellViT, CellViTShared, CellViT256, CellViT256Shared, CellViTSAM, CellViTSAMShared]: Best model loaded form checkpoint
DataLoader: Inference DataLoader
dict: Dataset configuration. Keys are:
* "tissue_types": describing the present tissue types with corresponding integer
* "nuclei_types": describing the present nuclei types with corresponding integer
"""
# get dataset
if test_folds is None:
if "test_folds" in self.run_conf["data"]:
if self.run_conf["data"]["test_folds"] is None:
self.logger.info(
"There was no test set provided. We now use the validation dataset for testing"
)
self.run_conf["data"]["test_folds"] = self.run_conf["data"][
"val_folds"
]
else:
self.logger.info(
"There was no test set provided. We now use the validation dataset for testing"
)
self.run_conf["data"]["test_folds"] = self.run_conf["data"]["val_folds"]
else:
self.run_conf["data"]["test_folds"] = self.run_conf["data"]["val_folds"]
self.logger.info(
f"Performing Inference on test set: {self.run_conf['data']['test_folds']}"
)
inference_dataset = select_dataset(
dataset_name=self.run_conf["data"]["dataset"],
split="test",
dataset_config=self.run_conf["data"],
transforms=transforms,
)
inference_dataloader = DataLoader(
inference_dataset,
batch_size=1,
num_workers=12,
pin_memory=False,
shuffle=False,
)
return inference_dataloader, self.dataset_config
def run_patch_inference(
self,
model: CellViT,
inference_dataloader: DataLoader,
dataset_config: dict,
generate_plots: bool = False,
) -> None:
"""Run Patch inference with given setup
Args:
model (Union[CellViT, CellViTShared, CellViT256, CellViT256Shared, CellViTSAM, CellViTSAMShared]): Model to use for inference
inference_dataloader (DataLoader): Inference Dataloader. Must return a batch with the following structure:
* Images (torch.Tensor)
* Masks (dict)
* Tissue types as str
* Image name as str
dataset_config (dict): Dataset configuration. Required keys are:
* "tissue_types": describing the present tissue types with corresponding integer
* "nuclei_types": describing the present nuclei types with corresponding integer
generate_plots (bool, optional): If inference plots should be generated. Defaults to False.
"""
# put model in eval mode
model.to(device=self.device)
model.eval()
# setup score tracker
image_names = [] # image names as str
binary_dice_scores = [] # binary dice scores per image
binary_jaccard_scores = [] # binary jaccard scores per image
pq_scores = [] # pq-scores per image
dq_scores = [] # dq-scores per image
sq_scores = [] # sq-scores per image
cell_type_pq_scores = [] # pq-scores per cell type and image
cell_type_dq_scores = [] # dq-scores per cell type and image
cell_type_sq_scores = [] # sq-scores per cell type and image
tissue_pred = [] # tissue predictions for each image
tissue_gt = [] # ground truth tissue image class
tissue_types_inf = [] # string repr of ground truth tissue image class
paired_all_global = [] # unique matched index pair
unpaired_true_all_global = (
[]
) # the index must exist in `true_inst_type_all` and unique
unpaired_pred_all_global = (
[]
) # the index must exist in `pred_inst_type_all` and unique
true_inst_type_all_global = [] # each index is 1 independent data point
pred_inst_type_all_global = [] # each index is 1 independent data point
# for detections scores
true_idx_offset = 0
pred_idx_offset = 0
inference_loop = tqdm.tqdm(
enumerate(inference_dataloader), total=len(inference_dataloader)
)
with torch.no_grad():
for batch_idx, batch in inference_loop:
batch_metrics = self.inference_step(
model, batch, generate_plots=generate_plots
)
# unpack batch_metrics
image_names = image_names + batch_metrics["image_names"]
# dice scores
binary_dice_scores = (
binary_dice_scores + batch_metrics["binary_dice_scores"]
)
binary_jaccard_scores = (
binary_jaccard_scores + batch_metrics["binary_jaccard_scores"]
)
# pq scores
pq_scores = pq_scores + batch_metrics["pq_scores"]
dq_scores = dq_scores + batch_metrics["dq_scores"]
sq_scores = sq_scores + batch_metrics["sq_scores"]
tissue_types_inf = tissue_types_inf + batch_metrics["tissue_types"]
cell_type_pq_scores = (
cell_type_pq_scores + batch_metrics["cell_type_pq_scores"]
)
cell_type_dq_scores = (
cell_type_dq_scores + batch_metrics["cell_type_dq_scores"]
)
cell_type_sq_scores = (
cell_type_sq_scores + batch_metrics["cell_type_sq_scores"]
)
tissue_pred.append(batch_metrics["tissue_pred"])
tissue_gt.append(batch_metrics["tissue_gt"])
# detection scores
true_idx_offset = (
true_idx_offset + true_inst_type_all_global[-1].shape[0]
if batch_idx != 0
else 0
)
pred_idx_offset = (
pred_idx_offset + pred_inst_type_all_global[-1].shape[0]
if batch_idx != 0
else 0
)
true_inst_type_all_global.append(batch_metrics["true_inst_type_all"])
pred_inst_type_all_global.append(batch_metrics["pred_inst_type_all"])
# increment the pairing index statistic
batch_metrics["paired_all"][:, 0] += true_idx_offset
batch_metrics["paired_all"][:, 1] += pred_idx_offset
paired_all_global.append(batch_metrics["paired_all"])
batch_metrics["unpaired_true_all"] += true_idx_offset
batch_metrics["unpaired_pred_all"] += pred_idx_offset
unpaired_true_all_global.append(batch_metrics["unpaired_true_all"])
unpaired_pred_all_global.append(batch_metrics["unpaired_pred_all"])
# assemble batches to datasets (global)
tissue_types_inf = [t.lower() for t in tissue_types_inf]
paired_all = np.concatenate(paired_all_global, axis=0)
unpaired_true_all = np.concatenate(unpaired_true_all_global, axis=0)
unpaired_pred_all = np.concatenate(unpaired_pred_all_global, axis=0)
true_inst_type_all = np.concatenate(true_inst_type_all_global, axis=0)
pred_inst_type_all = np.concatenate(pred_inst_type_all_global, axis=0)
paired_true_type = true_inst_type_all[paired_all[:, 0]]
paired_pred_type = pred_inst_type_all[paired_all[:, 1]]
unpaired_true_type = true_inst_type_all[unpaired_true_all]
unpaired_pred_type = pred_inst_type_all[unpaired_pred_all]
binary_dice_scores = np.array(binary_dice_scores)
binary_jaccard_scores = np.array(binary_jaccard_scores)
pq_scores = np.array(pq_scores)
dq_scores = np.array(dq_scores)
sq_scores = np.array(sq_scores)
tissue_detection_accuracy = accuracy_score(
y_true=np.concatenate(tissue_gt), y_pred=np.concatenate(tissue_pred)
)
f1_d, prec_d, rec_d = cell_detection_scores(
paired_true=paired_true_type,
paired_pred=paired_pred_type,
unpaired_true=unpaired_true_type,
unpaired_pred=unpaired_pred_type,
)
dataset_metrics = {
"Binary-Cell-Dice-Mean": float(np.nanmean(binary_dice_scores)),
"Binary-Cell-Jacard-Mean": float(np.nanmean(binary_jaccard_scores)),
"Tissue-Multiclass-Accuracy": tissue_detection_accuracy,
"bPQ": float(np.nanmean(pq_scores)),
"bDQ": float(np.nanmean(dq_scores)),
"bSQ": float(np.nanmean(sq_scores)),
"mPQ": float(np.nanmean([np.nanmean(pq) for pq in cell_type_pq_scores])),
"mDQ": float(np.nanmean([np.nanmean(dq) for dq in cell_type_dq_scores])),
"mSQ": float(np.nanmean([np.nanmean(sq) for sq in cell_type_sq_scores])),
"f1_detection": float(f1_d),
"precision_detection": float(prec_d),
"recall_detection": float(rec_d),
}
# calculate tissue metrics
tissue_types = dataset_config["tissue_types"]
tissue_metrics = {}
for tissue in tissue_types.keys():
tissue = tissue.lower()
tissue_ids = np.where(np.asarray(tissue_types_inf) == tissue)
tissue_metrics[f"{tissue}"] = {}
tissue_metrics[f"{tissue}"]["Dice"] = float(
np.nanmean(binary_dice_scores[tissue_ids])
)
tissue_metrics[f"{tissue}"]["Jaccard"] = float(
np.nanmean(binary_jaccard_scores[tissue_ids])
)
tissue_metrics[f"{tissue}"]["mPQ"] = float(
np.nanmean(
[np.nanmean(pq) for pq in np.array(cell_type_pq_scores)[tissue_ids]]
)
)
tissue_metrics[f"{tissue}"]["bPQ"] = float(
np.nanmean(pq_scores[tissue_ids])
)
# calculate nuclei metrics
nuclei_types = dataset_config["nuclei_types"]
nuclei_metrics_d = {}
nuclei_metrics_pq = {}
nuclei_metrics_dq = {}
nuclei_metrics_sq = {}
for nuc_name, nuc_type in nuclei_types.items():
if nuc_name.lower() == "background":
continue
nuclei_metrics_pq[nuc_name] = np.nanmean(
[pq[nuc_type] for pq in cell_type_pq_scores]
)
nuclei_metrics_dq[nuc_name] = np.nanmean(
[dq[nuc_type] for dq in cell_type_dq_scores]
)
nuclei_metrics_sq[nuc_name] = np.nanmean(
[sq[nuc_type] for sq in cell_type_sq_scores]
)
f1_cell, prec_cell, rec_cell = cell_type_detection_scores(
paired_true_type,
paired_pred_type,
unpaired_true_type,
unpaired_pred_type,
nuc_type,
)
nuclei_metrics_d[nuc_name] = {
"f1_cell": f1_cell,
"prec_cell": prec_cell,
"rec_cell": rec_cell,
}
# print final results
# binary
self.logger.info(f"{20*'*'} Binary Dataset metrics {20*'*'}")
[self.logger.info(f"{f'{k}:': <25} {v}") for k, v in dataset_metrics.items()]
# tissue -> the PQ values are bPQ values -> what about mBQ?
self.logger.info(f"{20*'*'} Tissue metrics {20*'*'}")
flattened_tissue = []
for key in tissue_metrics:
flattened_tissue.append(
[
key,
tissue_metrics[key]["Dice"],
tissue_metrics[key]["Jaccard"],
tissue_metrics[key]["mPQ"],
tissue_metrics[key]["bPQ"],
]
)
self.logger.info(
tabulate(
flattened_tissue, headers=["Tissue", "Dice", "Jaccard", "mPQ", "bPQ"]
)
)
# nuclei types
self.logger.info(f"{20*'*'} Nuclei Type Metrics {20*'*'}")
flattened_nuclei_type = []
for key in nuclei_metrics_pq:
flattened_nuclei_type.append(
[
key,
nuclei_metrics_dq[key],
nuclei_metrics_sq[key],
nuclei_metrics_pq[key],
]
)
self.logger.info(
tabulate(flattened_nuclei_type, headers=["Nuclei Type", "DQ", "SQ", "PQ"])
)
# nuclei detection metrics
self.logger.info(f"{20*'*'} Nuclei Detection Metrics {20*'*'}")
flattened_detection = []
for key in nuclei_metrics_d:
flattened_detection.append(
[
key,
nuclei_metrics_d[key]["prec_cell"],
nuclei_metrics_d[key]["rec_cell"],
nuclei_metrics_d[key]["f1_cell"],
]
)
self.logger.info(
tabulate(
flattened_detection,
headers=["Nuclei Type", "Precision", "Recall", "F1"],
)
)
# save all folds
image_metrics = {}
for idx, image_name in enumerate(image_names):
image_metrics[image_name] = {
"Dice": float(binary_dice_scores[idx]),
"Jaccard": float(binary_jaccard_scores[idx]),
"bPQ": float(pq_scores[idx]),
}
all_metrics = {
"dataset": dataset_metrics,
"tissue_metrics": tissue_metrics,
"image_metrics": image_metrics,
"nuclei_metrics_pq": nuclei_metrics_pq,
"nuclei_metrics_d": nuclei_metrics_d,
}
# saving
with open(str(self.run_dir / "inference_results.json"), "w") as outfile:
json.dump(all_metrics, outfile, indent=2)
def inference_step(
self,
model: CellViT,
batch: tuple,
generate_plots: bool = False,
) -> None:
"""Inference step for a patch-wise batch
Args:
model (CellViT): Model to use for inference
batch (tuple): Batch with the following structure:
* Images (torch.Tensor)
* Masks (dict)
* Tissue types as str
* Image name as str
generate_plots (bool, optional): If inference plots should be generated. Defaults to False.
"""
# unpack batch, for shape compare train_step method
imgs = batch[0].to(self.device)
masks = batch[1]
tissue_types = list(batch[2])
image_names = list(batch[3])
model.zero_grad()
if self.mixed_precision:
with torch.autocast(device_type="cuda", dtype=torch.float16):
predictions = model.forward(imgs)
else:
predictions = model.forward(imgs)
predictions = self.unpack_predictions(predictions=predictions, model=model)
gt = self.unpack_masks(masks=masks, tissue_types=tissue_types, model=model)
# scores
batch_metrics, scores = self.calculate_step_metric(predictions, gt, image_names)
batch_metrics["tissue_types"] = tissue_types
if generate_plots:
self.plot_results(
imgs=imgs,
predictions=predictions,
ground_truth=gt,
img_names=image_names,
num_nuclei_classes=self.num_classes,
outdir=Path(self.run_dir / "inference_predictions"),
scores=scores,
)
return batch_metrics
def run_single_image_inference( self, model: CellViT, image: np.ndarray, generate_plots: bool = True, ) -> None:
# set image transforms
transform_settings = self.run_conf["transformations"]
if "normalize" in transform_settings:
mean = transform_settings["normalize"].get("mean", (0.5, 0.5, 0.5))
std = transform_settings["normalize"].get("std", (0.5, 0.5, 0.5))
else:
mean = (0.5, 0.5, 0.5)
std = (0.5, 0.5, 0.5)
transforms = A.Compose([A.Normalize(mean=mean, std=std)])
transformed_img = transforms(image=image)["image"]
image = torch.from_numpy(transformed_img).permute(2, 0, 1).unsqueeze(0).float()
imgs = image.to(self.device)
model.zero_grad()
predictions = model.forward(imgs)
predictions = self.unpack_predictions(predictions=predictions, model=model)
image_output = self.plot_results(
imgs=imgs,
predictions=predictions,
num_nuclei_classes=self.num_classes,
outdir=Path(self.run_dir),
)
return image_output
def unpack_predictions(
self, predictions: dict, model: CellViT
) -> DataclassHVStorage:
"""Unpack the given predictions. Main focus lays on reshaping and postprocessing predictions, e.g. separating instances
Args:
predictions (dict): Dictionary with the following keys:
* tissue_types: Logit tissue prediction output. Shape: (batch_size, num_tissue_classes)
* nuclei_binary_map: Logit output for binary nuclei prediction branch. Shape: (batch_size, H, W, 2)
* hv_map: Logit output for hv-prediction. Shape: (batch_size, H, W, 2)
* nuclei_type_map: Logit output for nuclei instance-prediction. Shape: (batch_size, num_nuclei_classes, H, W)
model (CellViT): Current model
Returns:
DataclassHVStorage: Processed network output
"""
predictions["tissue_types"] = predictions["tissue_types"].to(self.device)
predictions["nuclei_binary_map"] = F.softmax(
predictions["nuclei_binary_map"], dim=1
) # shape: (batch_size, 2, H, W)
predictions["nuclei_type_map"] = F.softmax(
predictions["nuclei_type_map"], dim=1
) # shape: (batch_size, num_nuclei_classes, H, W)
(
predictions["instance_map"],
predictions["instance_types"],
) = model.calculate_instance_map(
predictions, magnification=self.magnification
) # shape: (batch_size, H', W')
predictions["instance_types_nuclei"] = model.generate_instance_nuclei_map(
predictions["instance_map"], predictions["instance_types"]
).permute(0, 3, 1, 2).to(
self.device
) # shape: (batch_size, num_nuclei_classes, H, W) change
predictions = DataclassHVStorage(
nuclei_binary_map=predictions["nuclei_binary_map"], #[64, 2, 256, 256]
hv_map=predictions["hv_map"], #[64, 2, 256, 256]
nuclei_type_map=predictions["nuclei_type_map"], #[64, 6, 256, 256]
tissue_types=predictions["tissue_types"], #[64,19]
instance_map=predictions["instance_map"], #[64, 256, 256]
instance_types=predictions["instance_types"], #list of 64 tensors, each tensor is [256,256]
instance_types_nuclei=predictions["instance_types_nuclei"], #[64,256,256,6]
batch_size=predictions["tissue_types"].shape[0],#64
)
return predictions
def unpack_masks(
self, masks: dict, tissue_types: list, model: CellViT
) -> DataclassHVStorage:
# get ground truth values, perform one hot encoding for segmentation maps
gt_nuclei_binary_map_onehot = (
F.one_hot(masks["nuclei_binary_map"], num_classes=2)
).type(
torch.float32
) # background, nuclei #[64, 256,256,2]
nuclei_type_maps = torch.squeeze(masks["nuclei_type_map"]).type(torch.int64) #[64,256,256]
gt_nuclei_type_maps_onehot = F.one_hot(
nuclei_type_maps, num_classes=self.num_classes
).type(
torch.float32
) # background + nuclei types [64, 256, 256, 6]
# assemble ground truth dictionary
gt = {
"nuclei_type_map": gt_nuclei_type_maps_onehot.permute(0, 3, 1, 2).to(
self.device
), # shape: (batch_size, H, W, num_nuclei_classes) #[64,256,256,6] ->[64,6,256,256]
"nuclei_binary_map": gt_nuclei_binary_map_onehot.permute(0, 3, 1, 2).to(
self.device
), # shape: (batch_size, H, W, 2) #[64,256,256,2] ->[64,2,256,256]
"hv_map": masks["hv_map"].to(self.device), # shape: (batch_size, H, W, 2)原来的是错的 [64, 2, 256, 256]
"instance_map": masks["instance_map"].to(
self.device
), # shape: (batch_size, H, W) -> each instance has one integer (64,256,256)
"instance_types_nuclei": (
gt_nuclei_type_maps_onehot * masks["instance_map"][..., None]
)
.permute(0, 3, 1, 2)
.to(
self.device
), # shape: (batch_size, num_nuclei_classes, H, W) -> instance has one integer, for each nuclei class (64,256,256,6)
"tissue_types": torch.Tensor(
[self.dataset_config["tissue_types"][t] for t in tissue_types]
)
.type(torch.LongTensor)
.to(self.device), # shape: batch_size 64
}
gt["instance_types"] = calculate_instances(
gt["nuclei_type_map"], gt["instance_map"]
)
gt = DataclassHVStorage(**gt, batch_size=gt["tissue_types"].shape[0])
return gt
def calculate_step_metric(
self,
predictions: DataclassHVStorage,
gt: DataclassHVStorage,
image_names: List[str],
) -> Tuple[dict, list]:
"""Calculate the metrics for the validation step
Args:
predictions (DataclassHVStorage): Processed network output
gt (DataclassHVStorage): Ground truth values
image_names (list(str)): List with image names
Returns:
Tuple[dict, list]:
* dict: Dictionary with metrics. Structure not fixed yet
* list with cell_dice, cell_jaccard and pq for each image
"""
predictions = predictions.get_dict()
gt = gt.get_dict()
# preparation and device movement
predictions["tissue_types_classes"] = F.softmax(
predictions["tissue_types"], dim=-1
)
pred_tissue = (
torch.argmax(predictions["tissue_types_classes"], dim=-1)
.detach()
.cpu()
.numpy()
.astype(np.uint8)
)
predictions["instance_map"] = predictions["instance_map"].detach().cpu()
predictions["instance_types_nuclei"] = (
predictions["instance_types_nuclei"].detach().cpu().numpy().astype("int32")
) # shape: (batch_size, num_nuclei_classes, H, W) [64,256,256,6]
instance_maps_gt = gt["instance_map"].detach().cpu() #[64,256,256]
gt["tissue_types"] = gt["tissue_types"].detach().cpu().numpy().astype(np.uint8)
gt["nuclei_binary_map"] = torch.argmax(gt["nuclei_binary_map"], dim=1).type(
torch.uint8
)
gt["instance_types_nuclei"] = (
gt["instance_types_nuclei"].detach().cpu().numpy().astype("int32")
) # shape: (batch_size, num_nuclei_classes, H, W) [64,6,256,256] ################################与前面的predictions的形状不同
# segmentation scores
binary_dice_scores = [] # binary dice scores per image
binary_jaccard_scores = [] # binary jaccard scores per image
pq_scores = [] # pq-scores per image
dq_scores = [] # dq-scores per image
sq_scores = [] # sq_scores per image
cell_type_pq_scores = [] # pq-scores per cell type and image
cell_type_dq_scores = [] # dq-scores per cell type and image
cell_type_sq_scores = [] # sq-scores per cell type and image
scores = [] # all scores in one list
# detection scores
paired_all = [] # unique matched index pair
unpaired_true_all = (
[]
) # the index must exist in `true_inst_type_all` and unique
unpaired_pred_all = (
[]
) # the index must exist in `pred_inst_type_all` and unique
true_inst_type_all = [] # each index is 1 independent data point
pred_inst_type_all = [] # each index is 1 independent data point
# for detections scores
true_idx_offset = 0
pred_idx_offset = 0
for i in range(len(pred_tissue)):
# binary dice score: Score for cell detection per image, without background
pred_binary_map = torch.argmax(predictions["nuclei_binary_map"][i], dim=0)
target_binary_map = gt["nuclei_binary_map"][i]
cell_dice = (
dice(preds=pred_binary_map, target=target_binary_map, ignore_index=0)
.detach()
.cpu()
)
binary_dice_scores.append(float(cell_dice))
# binary aji
cell_jaccard = (
binary_jaccard_index(
preds=pred_binary_map,
target=target_binary_map,
)
.detach()
.cpu()
)
binary_jaccard_scores.append(float(cell_jaccard))
# pq values
if len(np.unique(instance_maps_gt[i])) == 1:
dq, sq, pq = np.nan, np.nan, np.nan
else:
remapped_instance_pred = binarize(
predictions["instance_types_nuclei"][i][1:].transpose(1, 2, 0)
) #(256,6)
remapped_gt = remap_label(instance_maps_gt[i]) #(256,256)
# remapped_instance_pred = binarize(predictions["instance_types_nuclei"][i].transpose(2,1,0)[1:]) #[64,256,256,6]
[dq, sq, pq], _ = get_fast_pq(
true=remapped_gt, pred=remapped_instance_pred
) #(256,256) (256,256) true是instance map，在这里true的形状应该是真实的实例图，pred是预测的实例图，形状应该相等，都为(256,256)
pq_scores.append(pq)
dq_scores.append(dq)
sq_scores.append(sq)
scores.append(
[
cell_dice.detach().cpu().numpy(),
cell_jaccard.detach().cpu().numpy(),
pq,
]
)
# pq values per class (with class 0 beeing background -> should be skipped in the future)
nuclei_type_pq = []
nuclei_type_dq = []
nuclei_type_sq = []
for j in range(0, self.num_classes):
pred_nuclei_instance_class = remap_label(
predictions["instance_types_nuclei"][i][j, ...]
)
target_nuclei_instance_class = remap_label(
gt["instance_types_nuclei"][i][j, ...]
)
# if ground truth is empty, skip from calculation
if len(np.unique(target_nuclei_instance_class)) == 1:
pq_tmp = np.nan
dq_tmp = np.nan
sq_tmp = np.nan
else:
[dq_tmp, sq_tmp, pq_tmp], _ = get_fast_pq(
pred_nuclei_instance_class,
target_nuclei_instance_class,
match_iou=0.5,
)
nuclei_type_pq.append(pq_tmp)
nuclei_type_dq.append(dq_tmp)
nuclei_type_sq.append(sq_tmp)
# detection scores
true_centroids = np.array(
[v["centroid"] for k, v in gt["instance_types"][i].items()]
)
true_instance_type = np.array(
[v["type"] for k, v in gt["instance_types"][i].items()]
)
pred_centroids = np.array(
[v["centroid"] for k, v in predictions["instance_types"][i].items()]
)
pred_instance_type = np.array(
[v["type"] for k, v in predictions["instance_types"][i].items()]
)
if true_centroids.shape[0] == 0:
true_centroids = np.array([[0, 0]])
true_instance_type = np.array([0])
if pred_centroids.shape[0] == 0:
pred_centroids = np.array([[0, 0]])
pred_instance_type = np.array([0])
if self.magnification == 40:
pairing_radius = 12
else:
pairing_radius = 6
paired, unpaired_true, unpaired_pred = pair_coordinates(
true_centroids, pred_centroids, pairing_radius
)
true_idx_offset = (
true_idx_offset + true_inst_type_all[-1].shape[0] if i != 0 else 0
)
pred_idx_offset = (
pred_idx_offset + pred_inst_type_all[-1].shape[0] if i != 0 else 0
)
true_inst_type_all.append(true_instance_type)
pred_inst_type_all.append(pred_instance_type)
# increment the pairing index statistic
if paired.shape[0] != 0: # ! sanity
paired[:, 0] += true_idx_offset
paired[:, 1] += pred_idx_offset
paired_all.append(paired)
unpaired_true += true_idx_offset
unpaired_pred += pred_idx_offset
unpaired_true_all.append(unpaired_true)
unpaired_pred_all.append(unpaired_pred)
cell_type_pq_scores.append(nuclei_type_pq)
cell_type_dq_scores.append(nuclei_type_dq)
cell_type_sq_scores.append(nuclei_type_sq)
paired_all = np.concatenate(paired_all, axis=0)
unpaired_true_all = np.concatenate(unpaired_true_all, axis=0)
unpaired_pred_all = np.concatenate(unpaired_pred_all, axis=0)
true_inst_type_all = np.concatenate(true_inst_type_all, axis=0)
pred_inst_type_all = np.concatenate(pred_inst_type_all, axis=0)
batch_metrics = {
"image_names": image_names,
"binary_dice_scores": binary_dice_scores,
"binary_jaccard_scores": binary_jaccard_scores,
"pq_scores": pq_scores,
"dq_scores": dq_scores,
"sq_scores": sq_scores,
"cell_type_pq_scores": cell_type_pq_scores,
"cell_type_dq_scores": cell_type_dq_scores,
"cell_type_sq_scores": cell_type_sq_scores,
"tissue_pred": pred_tissue,
"tissue_gt": gt["tissue_types"],
"paired_all": paired_all,
"unpaired_true_all": unpaired_true_all,
"unpaired_pred_all": unpaired_pred_all,
"true_inst_type_all": true_inst_type_all,
"pred_inst_type_all": pred_inst_type_all,
}
return batch_metrics, scores
def plot_results(
self,
imgs: Union[torch.Tensor, np.ndarray],
predictions: dict,
num_nuclei_classes: int,
outdir: Union[Path, str],
) -> None:
# TODO: Adapt Docstring and function, currently not working with our shape
"""Generate example plot with image, binary_pred, hv-map and instance map from prediction and ground-truth
Args:
imgs (Union[torch.Tensor, np.ndarray]): Images to process, a random number (num_images) is selected from this stack
Shape: (batch_size, 3, H', W')
predictions (dict): Predictions of models. Keys:
"nuclei_type_map": Shape: (batch_size, H', W', num_nuclei)
"nuclei_binary_map": Shape: (batch_size, H', W', 2)
"hv_map": Shape: (batch_size, H', W', 2)
"instance_map": Shape: (batch_size, H', W')
ground_truth (dict): Ground truth values. Keys:
"nuclei_type_map": Shape: (batch_size, H', W', num_nuclei)
"nuclei_binary_map": Shape: (batch_size, H', W', 2)
"hv_map": Shape: (batch_size, H', W', 2)
"instance_map": Shape: (batch_size, H', W')
img_names (List): Names of images as list
num_nuclei_classes (int): Number of total nuclei classes including background
outdir (Union[Path, str]): Output directory where images should be stored
scores (List[List[float]], optional): List with scores for each image.
Each list entry is a list with 3 scores: Dice, Jaccard and bPQ for the image.
Defaults to None.
"""
outdir = Path(outdir)
outdir.mkdir(exist_ok=True, parents=True)
# permute for gt and predictions
predictions.hv_map = predictions.hv_map.permute(0, 2, 3, 1)
predictions.nuclei_binary_map = predictions.nuclei_binary_map.permute(0, 2, 3, 1)
predictions.nuclei_type_map = predictions.nuclei_type_map.permute(0, 2, 3, 1)
h = predictions.hv_map.shape[1]
w = predictions.hv_map.shape[2]
# convert to rgb and crop to selection
sample_images = (
imgs.permute(0, 2, 3, 1).contiguous().cpu().numpy()
) # convert to rgb
sample_images = cropping_center(sample_images, (h, w), True)
pred_sample_binary_map = (
predictions.nuclei_binary_map[:, :, :, 1].detach().cpu().numpy()
)
pred_sample_hv_map = predictions.hv_map.detach().cpu().numpy()
pred_sample_instance_maps = predictions.instance_map.detach().cpu().numpy()
pred_sample_type_maps = (
torch.argmax(predictions.nuclei_type_map, dim=-1).detach().cpu().numpy()
)
# create colormaps
hv_cmap = plt.get_cmap("jet")
binary_cmap = plt.get_cmap("jet")
instance_map = plt.get_cmap("viridis")
cell_colors = ["#ffffff", "#ff0000", "#00ff00", "#1e00ff", "#feff00", "#ffbf00"]
# invert the normalization of the sample images
transform_settings = self.run_conf["transformations"]
if "normalize" in transform_settings:
mean = transform_settings["normalize"].get("mean", (0.5, 0.5, 0.5))
std = transform_settings["normalize"].get("std", (0.5, 0.5, 0.5))
else:
mean = (0.5, 0.5, 0.5)
std = (0.5, 0.5, 0.5)
inv_normalize = transforms.Normalize(
mean=[-0.5 / mean[0], -0.5 / mean[1], -0.5 / mean[2]],
std=[1 / std[0], 1 / std[1], 1 / std[2]],
)
inv_samples = inv_normalize(torch.tensor(sample_images).permute(0, 3, 1, 2))
sample_images = inv_samples.permute(0, 2, 3, 1).detach().cpu().numpy()
for i in range(len(imgs)):
fig, axs = plt.subplots(figsize=(6, 2), dpi=300)
placeholder = np.zeros((h, 7 * w, 3))
# orig image
placeholder[:h, :w, :3] = sample_images[i]
# binary prediction
placeholder[: h, w : 2 * w, :3] = rgba2rgb(
binary_cmap(pred_sample_binary_map[i])
) # *255?
# hv maps
placeholder[: h, 2 * w : 3 * w, :3] = rgba2rgb(
hv_cmap((pred_sample_hv_map[i, :, :, 0] + 1) / 2)
)
placeholder[: h, 3 * w : 4 * w, :3] = rgba2rgb(
hv_cmap((pred_sample_hv_map[i, :, :, 1] + 1) / 2)
)
# instance_predictions
placeholder[: h, 4 * w : 5 * w, :3] = rgba2rgb(
instance_map(
(
pred_sample_instance_maps[i]
- np.min(pred_sample_instance_maps[i])
)
/ (
np.max(pred_sample_instance_maps[i])
- np.min(pred_sample_instance_maps[i] + 1e-10)
)
)
)
# type_predictions
placeholder[: h, 5 * w : 6 * w, :3] = rgba2rgb(
binary_cmap(pred_sample_type_maps[i] / num_nuclei_classes)
)
# contours
# pred
pred_contours_polygon = [
v["contour"] for v in predictions.instance_types[i].values()
]
pred_contours_polygon = [
list(zip(poly[:, 0], poly[:, 1])) for poly in pred_contours_polygon
]
pred_contour_colors_polygon = [
cell_colors[v["type"]]
for v in predictions.instance_types[i].values()
]
pred_cell_image = Image.fromarray(
(sample_images[i] * 255).astype(np.uint8)
).convert("RGB")
pred_drawing = ImageDraw.Draw(pred_cell_image)
add_patch = lambda poly, color: pred_drawing.polygon(
poly, outline=color, width=2
)
[
add_patch(poly, c)
for poly, c in zip(pred_contours_polygon, pred_contour_colors_polygon)
]
pred_cell_image.save("raw_pred.png")
placeholder[: h, 6 * w : 7 * w, :3] = (
np.asarray(pred_cell_image) / 255
)
# plotting
axs.imshow(placeholder)
axs.set_xticks(np.arange(w / 2, 7 * w, w))
axs.set_xticklabels(
[
"Image",
"Binary-Cells",
"HV-Map-0",
"HV-Map-1",
"Instances",
"Nuclei-Pred",
"Countours",
],
fontsize=6,
)
axs.xaxis.tick_top()
axs.set_yticks([ h /2 ])
axs.set_yticklabels(["Pred."], fontsize=6)
axs.tick_params(axis="both", which="both", length=0)
grid_x = np.arange(w, 6 * w, w)
grid_y = np.arange(h, 2 * h, h)
for x_seg in grid_x:
axs.axvline(x_seg, color="black")
for y_seg in grid_y:
axs.axhline(y_seg, color="black")
fig.suptitle(f"All Predictions for input image")
fig.tight_layout()
fig.savefig("pred_img.png")
plt.close()
# CLI
class InferenceCellViTParser:
def __init__(self) -> None:
parser = argparse.ArgumentParser(
formatter_class=argparse.ArgumentDefaultsHelpFormatter,
description="Perform CellViT inference for given run-directory with model checkpoints and logs",
)
parser.add_argument(
"--run_dir",
type=str,
help="Logging directory of a training run.",
default="./",
)
parser.add_argument(
"--checkpoint_name",
type=str,
help="Name of the checkpoint. Either select 'best_checkpoint.pth',"
"'latest_checkpoint.pth' or one of the intermediate checkpoint names,"
"e.g., 'checkpoint_100.pth'",
default="model_best.pth",
)
parser.add_argument(
"--gpu", type=int, help="Cuda-GPU ID for inference", default=0
)
parser.add_argument(
"--magnification",
type=int,
help="Dataset Magnification. Either 20 or 40. Default: 40",
choices=[20, 40],
default=40,
)
parser.add_argument(
"--plots",
action="store_true",
help="Generate inference plots in run_dir",
default=True,
)
self.parser = parser
def parse_arguments(self) -> dict:
opt = self.parser.parse_args()
return vars(opt)
if __name__ == "__main__":
configuration_parser = InferenceCellViTParser()
configuration = configuration_parser.parse_arguments()
print(configuration)
inf = InferenceCellViT(
run_dir=configuration["run_dir"],
checkpoint_name=configuration["checkpoint_name"],
gpu=configuration["gpu"],
magnification=configuration["magnification"],
)
model, dataloader, conf = inf.setup_patch_inference()
inf.run_patch_inference(
model, dataloader, conf, generate_plots=configuration["plots"]
)
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