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evaluate_predictions.py
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evaluate_predictions.py
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import multiprocessing
import os
from copy import deepcopy
from multiprocessing import Pool
from typing import Tuple, List, Union, Optional
import numpy as np
from batchgenerators.utilities.file_and_folder_operations import subfiles, join, save_json, load_json, \
isfile
from nnunetv2.configuration import default_num_processes
from nnunetv2.imageio.base_reader_writer import BaseReaderWriter
from nnunetv2.imageio.reader_writer_registry import determine_reader_writer_from_dataset_json, \
determine_reader_writer_from_file_ending
from nnunetv2.imageio.simpleitk_reader_writer import SimpleITKIO
# the Evaluator class of the previous nnU-Net was great and all but man was it overengineered. Keep it simple
from nnunetv2.utilities.json_export import recursive_fix_for_json_export
from nnunetv2.utilities.plans_handling.plans_handler import PlansManager
def label_or_region_to_key(label_or_region: Union[int, Tuple[int]]):
return str(label_or_region)
def key_to_label_or_region(key: str):
try:
return int(key)
except ValueError:
key = key.replace('(', '')
key = key.replace(')', '')
split = key.split(',')
return tuple([int(i) for i in split if len(i) > 0])
def save_summary_json(results: dict, output_file: str):
"""
json does not support tuples as keys (why does it have to be so shitty) so we need to convert that shit
ourselves
"""
results_converted = deepcopy(results)
# convert keys in mean metrics
results_converted['mean'] = {label_or_region_to_key(k): results['mean'][k] for k in results['mean'].keys()}
# convert metric_per_case
for i in range(len(results_converted["metric_per_case"])):
results_converted["metric_per_case"][i]['metrics'] = \
{label_or_region_to_key(k): results["metric_per_case"][i]['metrics'][k]
for k in results["metric_per_case"][i]['metrics'].keys()}
# sort_keys=True will make foreground_mean the first entry and thus easy to spot
save_json(results_converted, output_file, sort_keys=True)
def load_summary_json(filename: str):
results = load_json(filename)
# convert keys in mean metrics
results['mean'] = {key_to_label_or_region(k): results['mean'][k] for k in results['mean'].keys()}
# convert metric_per_case
for i in range(len(results["metric_per_case"])):
results["metric_per_case"][i]['metrics'] = \
{key_to_label_or_region(k): results["metric_per_case"][i]['metrics'][k]
for k in results["metric_per_case"][i]['metrics'].keys()}
return results
def labels_to_list_of_regions(labels: List[int]):
return [(i,) for i in labels]
def region_or_label_to_mask(segmentation: np.ndarray, region_or_label: Union[int, Tuple[int, ...]]) -> np.ndarray:
if np.isscalar(region_or_label):
return segmentation == region_or_label
else:
mask = np.zeros_like(segmentation, dtype=bool)
for r in region_or_label:
mask[segmentation == r] = True
return mask
def compute_tp_fp_fn_tn(mask_ref: np.ndarray, mask_pred: np.ndarray, ignore_mask: np.ndarray = None):
if ignore_mask is None:
use_mask = np.ones_like(mask_ref, dtype=bool)
else:
use_mask = ~ignore_mask
tp = np.sum((mask_ref & mask_pred) & use_mask)
fp = np.sum(((~mask_ref) & mask_pred) & use_mask)
fn = np.sum((mask_ref & (~mask_pred)) & use_mask)
tn = np.sum(((~mask_ref) & (~mask_pred)) & use_mask)
return tp, fp, fn, tn
def compute_metrics(reference_file: str, prediction_file: str, image_reader_writer: BaseReaderWriter,
labels_or_regions: Union[List[int], List[Union[int, Tuple[int, ...]]]],
ignore_label: int = None) -> dict:
# load images
seg_ref, seg_ref_dict = image_reader_writer.read_seg(reference_file)
seg_pred, seg_pred_dict = image_reader_writer.read_seg(prediction_file)
ignore_mask = seg_ref == ignore_label if ignore_label is not None else None
results = {}
results['reference_file'] = reference_file
results['prediction_file'] = prediction_file
results['metrics'] = {}
for r in labels_or_regions:
results['metrics'][r] = {}
mask_ref = region_or_label_to_mask(seg_ref, r)
mask_pred = region_or_label_to_mask(seg_pred, r)
tp, fp, fn, tn = compute_tp_fp_fn_tn(mask_ref, mask_pred, ignore_mask)
if tp + fp + fn == 0:
results['metrics'][r]['Dice'] = np.nan
results['metrics'][r]['IoU'] = np.nan
else:
results['metrics'][r]['Dice'] = 2 * tp / (2 * tp + fp + fn)
results['metrics'][r]['IoU'] = tp / (tp + fp + fn)
results['metrics'][r]['FP'] = fp
results['metrics'][r]['TP'] = tp
results['metrics'][r]['FN'] = fn
results['metrics'][r]['TN'] = tn
results['metrics'][r]['n_pred'] = fp + tp
results['metrics'][r]['n_ref'] = fn + tp
return results
def compute_metrics_on_folder(folder_ref: str, folder_pred: str, output_file: str,
image_reader_writer: BaseReaderWriter,
file_ending: str,
regions_or_labels: Union[List[int], List[Union[int, Tuple[int, ...]]]],
ignore_label: int = None,
num_processes: int = default_num_processes,
chill: bool = True) -> dict:
"""
output_file must end with .json; can be None
"""
if output_file is not None:
assert output_file.endswith('.json'), 'output_file should end with .json'
files_pred = subfiles(folder_pred, suffix=file_ending, join=False)
files_ref = subfiles(folder_ref, suffix=file_ending, join=False)
if not chill:
present = [isfile(join(folder_pred, i)) for i in files_ref]
assert all(present), "Not all files in folder_ref exist in folder_pred"
files_ref = [join(folder_ref, i) for i in files_pred]
files_pred = [join(folder_pred, i) for i in files_pred]
with multiprocessing.get_context("spawn").Pool(num_processes) as pool:
# for i in list(zip(files_ref, files_pred, [image_reader_writer] * len(files_pred), [regions_or_labels] * len(files_pred), [ignore_label] * len(files_pred))):
# compute_metrics(*i)
results = pool.starmap(
compute_metrics,
list(zip(files_ref, files_pred, [image_reader_writer] * len(files_pred), [regions_or_labels] * len(files_pred),
[ignore_label] * len(files_pred)))
)
# mean metric per class
metric_list = list(results[0]['metrics'][regions_or_labels[0]].keys())
means = {}
for r in regions_or_labels:
means[r] = {}
for m in metric_list:
means[r][m] = np.nanmean([i['metrics'][r][m] for i in results])
# foreground mean
foreground_mean = {}
for m in metric_list:
values = []
for k in means.keys():
if k == 0 or k == '0':
continue
values.append(means[k][m])
foreground_mean[m] = np.mean(values)
[recursive_fix_for_json_export(i) for i in results]
recursive_fix_for_json_export(means)
recursive_fix_for_json_export(foreground_mean)
result = {'metric_per_case': results, 'mean': means, 'foreground_mean': foreground_mean}
if output_file is not None:
save_summary_json(result, output_file)
return result
# print('DONE')
def compute_metrics_on_folder2(folder_ref: str, folder_pred: str, dataset_json_file: str, plans_file: str,
output_file: str = None,
num_processes: int = default_num_processes,
chill: bool = False):
dataset_json = load_json(dataset_json_file)
# get file ending
file_ending = dataset_json['file_ending']
# get reader writer class
example_file = subfiles(folder_ref, suffix=file_ending, join=True)[0]
rw = determine_reader_writer_from_dataset_json(dataset_json, example_file)()
# maybe auto set output file
if output_file is None:
output_file = join(folder_pred, 'summary.json')
lm = PlansManager(plans_file).get_label_manager(dataset_json)
compute_metrics_on_folder(folder_ref, folder_pred, output_file, rw, file_ending,
lm.foreground_regions if lm.has_regions else lm.foreground_labels, lm.ignore_label,
num_processes, chill=chill)
def compute_metrics_on_folder_simple(folder_ref: str, folder_pred: str, labels: Union[Tuple[int, ...], List[int]],
output_file: str = None,
num_processes: int = default_num_processes,
ignore_label: int = None,
chill: bool = False):
example_file = subfiles(folder_ref, join=True)[0]
file_ending = os.path.splitext(example_file)[-1]
rw = determine_reader_writer_from_file_ending(file_ending, example_file, allow_nonmatching_filename=True,
verbose=False)()
# maybe auto set output file
if output_file is None:
output_file = join(folder_pred, 'summary.json')
compute_metrics_on_folder(folder_ref, folder_pred, output_file, rw, file_ending,
labels, ignore_label=ignore_label, num_processes=num_processes, chill=chill)
def evaluate_folder_entry_point():
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('gt_folder', type=str, help='folder with gt segmentations')
parser.add_argument('pred_folder', type=str, help='folder with predicted segmentations')
parser.add_argument('-djfile', type=str, required=True,
help='dataset.json file')
parser.add_argument('-pfile', type=str, required=True,
help='plans.json file')
parser.add_argument('-o', type=str, required=False, default=None,
help='Output file. Optional. Default: pred_folder/summary.json')
parser.add_argument('-np', type=int, required=False, default=default_num_processes,
help=f'number of processes used. Optional. Default: {default_num_processes}')
parser.add_argument('--chill', action='store_true', help='dont crash if folder_pred does not have all files that are present in folder_gt')
args = parser.parse_args()
compute_metrics_on_folder2(args.gt_folder, args.pred_folder, args.djfile, args.pfile, args.o, args.np, chill=args.chill)
def evaluate_simple_entry_point():
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('gt_folder', type=str, help='folder with gt segmentations')
parser.add_argument('pred_folder', type=str, help='folder with predicted segmentations')
parser.add_argument('-l', type=int, nargs='+', required=True,
help='list of labels')
parser.add_argument('-il', type=int, required=False, default=None,
help='ignore label')
parser.add_argument('-o', type=str, required=False, default=None,
help='Output file. Optional. Default: pred_folder/summary.json')
parser.add_argument('-np', type=int, required=False, default=default_num_processes,
help=f'number of processes used. Optional. Default: {default_num_processes}')
parser.add_argument('--chill', action='store_true', help='dont crash if folder_pred does not have all files that are present in folder_gt')
args = parser.parse_args()
compute_metrics_on_folder_simple(args.gt_folder, args.pred_folder, args.l, args.o, args.np, args.il, chill=args.chill)
if __name__ == '__main__':
folder_ref = '/media/fabian/data/nnUNet_raw/Dataset004_Hippocampus/labelsTr'
folder_pred = '/home/fabian/results/nnUNet_remake/Dataset004_Hippocampus/nnUNetModule__nnUNetPlans__3d_fullres/fold_0/validation'
output_file = '/home/fabian/results/nnUNet_remake/Dataset004_Hippocampus/nnUNetModule__nnUNetPlans__3d_fullres/fold_0/validation/summary.json'
image_reader_writer = SimpleITKIO()
file_ending = '.nii.gz'
regions = labels_to_list_of_regions([1, 2])
ignore_label = None
num_processes = 12
compute_metrics_on_folder(folder_ref, folder_pred, output_file, image_reader_writer, file_ending, regions, ignore_label,
num_processes)