Initial commit

AI_Inference_Direct_MCDropout.py

+#!/usr/bin/env python3
+
+import os
+import sys
+import argparse
+import time 
+
+# Device for CUDA 
+os.environ["CUDA_VISIBLE_DEVICES"] = "2"
+
+
+import torch
+import torch.nn as nn
+import numpy as np
+import pandas as pd
+import torchio as tio  
+import imageio
+import math 
+
+from network import *
+import utils
+import dataset
+
+# --------------------
+# Model - FC layers
+dict_fc_features = {
+	# Phase1- concatenation on 3rd layer
+	'Phase1': [2048,512,256,64],
+	'Phase2': [128,64,32],
+}
+# MC Dropout
+mc_dropout = True
+mc_passes = 50
+# --------------------
+
+def arg_parser():
+	parser = argparse.ArgumentParser(description='Inference - ')
+	required = parser.add_argument_group('Required')
+	required.add_argument('--input', type=str, required=True,
+						  help='Combined TIFF file (multi-layer)')
+	required.add_argument('--network', type=str, required=True,
+						  help='pytorch neural network')
+	required.add_argument('--output', type=str, required=True,
+						  help='Image prediction (2D TIFF file)')
+	options = parser.add_argument_group('Options')
+	options.add_argument('--tile_size', type=int, default=15,
+						  help='tile size')
+	options.add_argument('--adjacent_tiles_dim', type=int, default=1,
+						  help='adjacent tiles dim (e.g. 3, 5)')
+	options.add_argument('--bs', type=int, default=5000,
+						  help='Batch size (default 5000)')
+	options.add_argument('--output_median', type=str,
+						  help='Image output - median for MCDropout (2D TIFF file)')
+	options.add_argument('--output_cv', type=str,
+						  help='Image output - Coefficient of Variation for MCDropout (2D TIFF file)')
+	return parser
+
+
+def apply_dropout(m):
+	if m.__class__.__name__.startswith('Dropout'):
+		print('\t\t Enabling MC dropout!')
+		m.train()
+
+#MAIN
+def main(args=None):
+	args = arg_parser().parse_args(args)
+	InputFile = args.input
+	ModelName = args.network
+	OutputFile = args.output
+	OutputFile_median = args.output_median
+	OutputFile_CV = args.output_cv
+	TileSize = args.tile_size
+	AdjacentTilesDim = args.adjacent_tiles_dim
+	bs = args.bs
+
+	device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu")
+
+	print('\n--------------------')
+	since1 = time.time()
+
+
+	# TorchIO subject
+	print('\nGenerating TIO subject...')
+	Subject = tio.Subject(
+		Combined = tio.ScalarImage(InputFile),
+	)
+
+	# Initialize variables
+	InputFile_Shape = Subject['Combined'].shape
+	NbTiles_H = InputFile_Shape[1] // TileSize
+	NbTiles_W = InputFile_Shape[2] // TileSize
+	NbImageLayers = InputFile_Shape[3]
+	NbCorrLayers = NbImageLayers -4
+	InputDepth = NbCorrLayers
+	print('InputFile_Shape: ', InputFile_Shape)
+	print('NbTiles_H: ', NbTiles_H)
+	print('NbTiles_W: ', NbTiles_W)
+	print('NbImageLayers: ', NbImageLayers)
+	print('InputDepth: ', InputDepth)
+
+
+	# GridSampler
+	print('\nGenerating Grid Sampler...')
+	patch_size, patch_overlap, padding_mode = dataset.initialize_gridsampler_variables(NbImageLayers, TileSize, AdjacentTilesDim, padding_mode=None)
+	print('patch_size: ',patch_size)
+	print('patch_overlap: ',patch_overlap)
+	print('padding_mode: ',padding_mode)
+	
+
+	grid_sampler = tio.data.GridSampler(
+		subject = Subject,
+		patch_size = patch_size,
+		patch_overlap = patch_overlap,
+		padding_mode = padding_mode,
+	)
+	len_grid_sampler = len(grid_sampler)
+	print('length grid_sampler', len(grid_sampler))
+
+	patch_loader = torch.utils.data.DataLoader(grid_sampler, batch_size=bs)
+	aggregator = tio.data.GridAggregator(grid_sampler, overlap_mode = 'average')
+	
+	print('\nLoading DNN model...')
+	model = MyParallelNetwork(InputDepth, TileSize, AdjacentTilesDim, dict_fc_features)
+	model.load_state_dict(torch.load(ModelName))
+	print(model)
+	model.to(device)
+	model.eval()
+	if mc_dropout:
+		print('\t MC Dropout')
+		model.apply(apply_dropout)
+
+	print('\nPatch-based inference...')
+	since2 = time.time()
+	#model = nn.Identity().eval()
+	with torch.no_grad():
+		for patch_idx, patches_batch in enumerate(patch_loader):
+			print('\t patch_idx: ', patch_idx)
+
+			#print('\t\t Preparing data...')
+			inputs = patches_batch['Combined'][tio.DATA]
+			print('\t\t inputs shape: ', inputs.shape)
+			input1_tiles, input2_tiles_real, GroundTruth_real = dataset.prepare_data_withfiltering(inputs, NbImageLayers, NbCorrLayers, TileSize, AdjacentTilesDim)
+			#print('\t\t Preparing data - done -')
+
+			input1_tiles = input1_tiles.to(device)
+			input2_tiles_real = input2_tiles_real.to(device)
+			#GroundTruth_real = GroundTruth_real.to(device)
+			# Reducing last dimension to compute loss
+			#GroundTruth_real = torch.squeeze(GroundTruth_real, dim=2)
+
+			print('\t\t input1_tiles shape: ', input1_tiles.shape)
+			print('\t\t input2_tiles_real shape:', input2_tiles_real.shape)
+			
+			if mc_dropout:
+				# Perform multiple inference (mc_passes)
+				outputs_all = torch.empty(size=(mc_passes, input1_tiles.shape[0])).to(device)
+				for i in range(0, mc_passes):			
+					outputs = model(input1_tiles, input2_tiles_real)
+					outputs_all[i] = torch.squeeze(outputs)
+
+				# Compute mean, std, CV (coefficient of variation), SE (standard error)
+				outputs_mean = torch.mean(outputs_all,0)
+				outputs_median = torch.median(outputs_all,0)[0]
+				outputs_std = torch.std(outputs_all,0)
+				outputs_cv = torch.div(outputs_std, torch.abs(outputs_mean))
+				# outputs_se = torch.div(outputs_std, math.sqrt(mc_passes))
+				outputs_combined = torch.stack((outputs_mean, outputs_median, outputs_cv), dim=1)
+				
+				print('\t\t outputs shape: ',outputs.shape)
+				print('\t\t outputs device', outputs.device)
+				print('\t\t outputs_all shape: ', outputs_all.shape)
+				print('\t\t outputs_all device', outputs_all.device)
+				print('\t\t outputs_mean shape: ', outputs_mean.shape)
+				print('\t\t outputs_median shape: ', outputs_median.shape)
+				print('\t\t outputs_median type: ', outputs_median.type())
+				print('\t\t outputs_combined shape: ', outputs_combined.shape)
+
+				print('\t\t outputs_mean[:20]',outputs_mean[:20])
+				print('\t\t outputs_median[:20]',outputs_median[:20])
+				print('\t\t outputs_std[:20]',outputs_std[:20])
+				print('\t\t outputs_cv[:20]',outputs_cv[:20])
+			else:
+				outputs_combined = model(input1_tiles, input2_tiles_real)
+			
+			print('\t\t outputs_combined device', outputs_combined.device)
+			print('\t\t outputs_combined shape: ', outputs_combined.shape)
+
+			# Reshape outputs to match location dimensions
+			outputs_combined_reshape = torch.reshape(outputs_combined,[outputs_combined.shape[0],outputs_combined.shape[1],1,1,1])
+			print('\t\t outputs_combined_reshape shape: ', outputs_combined_reshape.shape)
+			
+			input_location = patches_batch[tio.LOCATION]
+			print('\t\t input_location shape: ', input_location.shape)
+			print('\t\t input_location type: ', input_location.dtype)
+			print('\t\t input_location[:20]: ', input_location[:20])
+
+			# Reshape input_location to prediction_location, to fit output image size (78,62,1)
+			pred_location = dataset.prediction_patch_location(input_location, TileSize, AdjacentTilesDim)
+			print('\t\t pred_location shape: ', pred_location.shape)
+			print('\t\t pred_location[:20]: ', pred_location[:20])
+
+			# Add batch with location to TorchIO aggregator
+			aggregator.add_batch(outputs_combined_reshape, pred_location)
+
+	# output_tensor shape [3, 1170, 930, 124]
+	output_tensor_combined = aggregator.get_output_tensor()
+	print('output_tensor_combined type: ', output_tensor_combined.dtype)
+	print('output_tensor_combined shape: ', output_tensor_combined.shape)
+
+	# Extract real information of interest [3, 78,62]
+	output_tensor_combined_real = output_tensor_combined[:,:NbTiles_H,:NbTiles_W,0]
+	print('output_tensor_combined_real shape: ', output_tensor_combined_real.shape)
+
+	output_combined_np = output_tensor_combined_real.numpy().squeeze()
+	print('output_combined_np type', output_combined_np.dtype)
+	print('output_combined_np shape', output_combined_np.shape)
+
+	if mc_dropout:
+		output_mean_np = output_combined_np[0,...]
+		output_median_np = output_combined_np[1,...]
+		output_cv_np = output_combined_np[2,...]
+		
+		imageio_output_mean = np.moveaxis(output_mean_np, 0,1)
+		imageio_output_median = np.moveaxis(output_median_np, 0,1)
+		imageio_output_cv = np.moveaxis(output_cv_np, 0,1)
+		print('imageio_output_mean shape', imageio_output_mean.shape)
+		print('imageio_output_median shape', imageio_output_median.shape)
+		print('imageio_output_cv shape', imageio_output_cv.shape)
+
+	else:
+		output_np = output_combined_np
+		imageio_output = np.moveaxis(output_np, 0,1)
+		print('imageio_output shape', imageio_output.shape)
+		
+	
+	time_elapsed2 = time.time() - since2
+	
+	if mc_dropout:
+		print('Writing output mean image via imageio...')
+		imageio.imwrite(OutputFile, imageio_output_mean)
+		print('Writing output median image via imageio...')
+		imageio.imwrite(OutputFile_median, imageio_output_median)
+		print('Writing output CV image via imageio...')
+		imageio.imwrite(OutputFile_CV, imageio_output_cv)
+	else:
+		print('Writing output image via imageio...')
+		imageio.imwrite(OutputFile, imageio_output)
+		
+
+	time_elapsed3 = time.time() - since2
+	time_elapsed1 = time.time() - since1
+	print('--- Inference in {:.2f}s---'.format(time_elapsed2))
+	print('--- Inference and saving in {:.2f}s---'.format(time_elapsed3))
+	print('--- Total time in {:.2f}s---'.format(time_elapsed1))
+
+if __name__ == '__main__':
+	sys.exit(main(sys.argv[1:]))
+
+

AI_Training.py

+# -*- coding: utf-8 -*-
+
+"""
+AI analysis via parallel neural networks
+
+"""
+
+
+import numpy as np
+import pandas as pd
+import matplotlib.pyplot as plt
+import sys
+import os
+import copy
+import yaml
+import argparse
+
+# Device for CUDA 
+os.environ["CUDA_VISIBLE_DEVICES"] = "2"
+
+import torch
+from torch.utils.tensorboard import SummaryWriter
+from torch.utils.data import DataLoader
+import torchio as tio  
+
+# -----------
+from model import *
+import utils
+import dataset
+import sampler
+
+
+# Manual seed
+torch.manual_seed(42)
+######################################################################
+
+
+def arg_parser():
+	parser = argparse.ArgumentParser(description='AI analysis - DNN training')
+	required = parser.add_argument_group('Required')
+	required.add_argument('--config', type=str, required=True,
+		help='YAML configuration / parameter file')
+	options = parser.add_argument_group('Options')
+	options.add_argument('--verbose', action="store_true",
+						  help='verbose mode')
+	return parser
+
+
+def main(args=None):
+	args = arg_parser().parse_args(args)
+	config_filename = args.config
+	
+
+	# plt.ion()   # interactive mode
+
+
+	######################################################################
+	# Loading parameter file
+
+	print('\n--- Loading configuration file --- ')
+	with open(config_filename,'r') as yaml_file:
+		config_file = yaml.safe_load(yaml_file)
+
+	if args.verbose:
+		print('config_file', config_file)
+	
+	# Defining parameters
+	CSVFile_train = config_file['CSVFile_train']
+	CSVFile_val = config_file['CSVFile_val']
+
+	model_filename = config_file['ModelName']
+	loss_filename = config_file['LossName']
+
+	nb_image_layers = config_file['NbImageLayers']
+	nb_corr_layers = config_file['NbCorrLayers']
+	tile_size = config_file['TileSize']
+	adjacent_tiles_dim = config_file['AdjacentTilesDim']
+	
+	num_workers = config_file['num_workers'] 
+	samples_per_volume = config_file['samples_per_volume']
+	queue_length = config_file['queue_length']
+	
+	data_filtering = config_file['DataFiltering']
+	confidence_threshold = config_file['ConfidenceThreshold']
+
+	dict_fc_features = config_file['dict_fc_features']
+	bs = config_file['bs']
+	lr = config_file['lr']
+	nb_epochs = config_file['nb_epochs']
+	# ------------------
+
+
+	print('\n--- Generating torchIO dataset ---')
+
+	File_list_train, TIOSubjects_list_train = dataset.GenerateTIOSubjectsList(CSVFile_train)
+	File_list_test, TIOSubjects_list_test = dataset.GenerateTIOSubjectsList(CSVFile_val)
+	
+	# torchIO transforms
+	TIOtransforms = [
+		tio.RandomFlip(axes=('lr')),
+	]
+	TIOtransform = tio.Compose(TIOtransforms)
+
+	# TIO dataset
+	TIOSubjects_dataset_train = tio.SubjectsDataset(TIOSubjects_list_train, transform=TIOtransform)
+	TIOSubjects_dataset_test = tio.SubjectsDataset(TIOSubjects_list_test, transform=None)
+
+	print('Training set: ', len(TIOSubjects_dataset_train), 'subjects')
+	print('Validation set: ', len(TIOSubjects_dataset_test), 'subjects')
+	# ------------------
+
+
+	# ------------------
+	# Subject visualization
+	if args.verbose:
+		print('\n--- Quality control: TIOSubject Info ---')
+		MyTIOSubject = TIOSubjects_dataset_train[0]
+		print('MySubject: ', MyTIOSubject)
+		print('MySubject.shape: ', MyTIOSubject.shape)
+		print('MySubject.spacing: ', MyTIOSubject.spacing)
+		print('MySubject.spatial_shape: ', MyTIOSubject.spatial_shape)
+		print('MySubject.spatial_shape.type: ', type(MyTIOSubject.spatial_shape))
+		print('MySubject history: ', MyTIOSubject.get_composed_history())
+	# ------------------
+
+	
+	# - - - - - - - - - - - - - -
+	# Training with GridSampler
+
+	# patch_size, patch_overlap, padding_mode = dataset.initialize_gridsampler_variables(nb_image_layers, tile_size, adjacent_tiles_dim, padding_mode=None)
+	# print('patch_size: ',patch_size)
+	# print('patch_overlap: ',patch_overlap)
+	# print('padding_mode: ',padding_mode)
+
+	# example_grid_sampler = tio.data.GridSampler(
+	# 	subject = MyTIOSubject,
+	# 	patch_size = patch_size,
+	# 	patch_overlap = patch_overlap,
+	# 	padding_mode = padding_mode,
+	# )
+	# samples_per_volume = len(example_grid_sampler)
+	# queue_length = samples_per_volume * num_workers
+	# print('samples_per_volume', samples_per_volume)
+	# print('queue_length', queue_length)
+
+	# sampler_train = tio.data.GridSampler(
+	# 	patch_size = patch_size,
+	# 	patch_overlap = patch_overlap,
+	# 	padding_mode = padding_mode,
+	# )
+	# sampler_test = tio.data.GridSampler(
+	# 	patch_size = patch_size,
+	# 	patch_overlap = patch_overlap,
+	# 	padding_mode = padding_mode,
+	# )
+	# - - - - - - - - - - - - - -
+	
+	# - - - - - - - - - - - - - -
+	# Training with UniformSampler
+	print('\n--- Initializing patch sampling variables ---')
+	
+	patch_size, patch_overlap, padding_mode = dataset.initialize_uniformsampler_variables(nb_image_layers, tile_size, adjacent_tiles_dim, padding_mode=None)
+	if args.verbose:
+		print('patch_size: ',patch_size)
+		print('patch_overlap: ',patch_overlap)
+		print('padding_mode: ',padding_mode)
+		print('samples_per_volume', samples_per_volume)
+		print('queue_length', queue_length)
+
+	sampler_train = sampler.MyUniformSampler(
+		patch_size = patch_size,
+		tile_size = tile_size,
+	)
+	sampler_test = sampler.MyUniformSampler(
+		patch_size = patch_size,
+		tile_size = tile_size,
+	)
+
+	patches_queue_train = tio.Queue(
+		subjects_dataset = TIOSubjects_dataset_train,
+		max_length = queue_length,
+		samples_per_volume = samples_per_volume,
+		sampler = sampler_train,
+		num_workers = num_workers,
+		shuffle_subjects = True, 
+		shuffle_patches = True, 
+	)
+	patches_queue_test = tio.Queue(
+		subjects_dataset = TIOSubjects_dataset_test,
+		max_length = queue_length,
+		samples_per_volume = samples_per_volume,
+		sampler = sampler_test,
+		num_workers = num_workers,
+		shuffle_subjects = True,
+		shuffle_patches = True,
+	)
+	
+	patches_loader_train = DataLoader(
+		patches_queue_train,
+		batch_size = bs,
+		shuffle = True,
+		num_workers = 0,  # this must be 0
+	)
+
+	patches_loader_test = DataLoader(
+		patches_queue_test,
+		batch_size = bs,
+		shuffle = False,
+		num_workers = 0,  # this must be 0
+	)
+
+	# Dictionary for patch data loaders
+	patches_loader_dict = {}
+	patches_loader_dict['train'] = patches_loader_train
+	patches_loader_dict['val'] = patches_loader_test
+
+
+	# ----------------------
+	# Visualize input data
+
+	writer = SummaryWriter('tensorboard/MyNetwork')
+
+	# # Get a batch of training data
+	print('\n--- Quality control: patch inputs ---')
+	patches_batch = next(iter(patches_loader_dict['val']))
+	inputs = patches_batch['Combined'][tio.DATA]
+	locations = patches_batch[tio.LOCATION]
+
+
+	# Variable initialization needed for TensorBoard
+	input_Corr_tiles, input_TargetDisp_tiles_real, GroundTruth_real = dataset.prepare_data_withfiltering(inputs, nb_image_layers, nb_corr_layers, tile_size, adjacent_tiles_dim, data_filtering, confidence_threshold)
+	if args.verbose:
+		print('\ninput_Corr_tiles.shape: ', input_Corr_tiles.shape)
+		print('input_TargetDisp_tiles_real.shape: ', input_TargetDisp_tiles_real.shape)
+		print('GroundTruth_real.shape: ', GroundTruth_real.shape)
+	
+
+	######################################################################
+	# Neural network - training 
+	# ----------------------
+	#
+	# Create a neural network model and start training / testing.
+	#
+
+	# ----------------------
+	# Create model
+	print('\n--- Creating neural network architecture ---')
+	model_ft = Model(writer, nb_image_layers, nb_corr_layers, tile_size, adjacent_tiles_dim, model_filename, dict_fc_features, loss_filename, data_filtering, confidence_threshold)
+
+	# Tensorboard - add graph
+	writer.add_graph(model_ft.model, [input_Corr_tiles.to(model_ft.device), input_TargetDisp_tiles_real.to(model_ft.device)])
+	writer.close()
+
+
+	# ----------------------
+	# Train and evaluate
+	print('\n--- DNN training ---')
+	model_ft.train_model(dataloaders=patches_loader_dict, lr=lr, nb_epochs=nb_epochs)
+	
+	# ----------------------
+	# Evaluate on validation data
+	print('\n--- DNN testing ---')
+	model_ft.test_model(dataloaders=patches_loader_dict)
+
+	# plt.ioff()
+	# plt.show()
+
+if __name__ == "__main__":
+	main()

CommandLine_AI_Inference_CSV.txt

+
+# - - - - - - - - -
+# Inference on real validation data - CSV file
+
+# Environment 1
+
+python3 AI_Inference_CSV.py --config ./Config_Files/AI_Inference_Config_Tiles1x1.yaml --verbose
+
+

CommandLine_AI_Training_All.txt

+python3 AI_Training.py --config ./Config_Files/AI_Training_Config_Tiles1x1.yaml > AI_Training_Tiles1x1_MCDropout.log
+python3 AI_Training.py --config ./Config_Files/AI_Training_Config_Tiles3x3.yaml > AI_Training_Tiles3x3_MCDropout.log
+python3 AI_Training.py --config ./Config_Files/AI_Training_Config_Tiles5x5.yaml > AI_Training_Tiles5x5_MCDropout.log

Config_Files/AI_Inference_Config_Tiles1x1.yaml

+---
+# Input files
+CSVFile: '../Example_CSV/Data_Example_val.csv'
+ModelName: './pytorch_IRTPNet_Tiles1x1_WithFiltering0.0_MCDropout.h5'
+
+# Output files
+OutputFolder: 'CNN_Output_WithFiltering_MCDropout/'
+OutputSuffix: 'Pred_IRTPNet_Tiles1x1_WithFiltering0.0_MCDropout'
+
+# Data parameters
+NbImageLayers: 124
+NbCorrLayers: 120
+TileSize: 15
+AdjacentTilesDim: 1 # 1 for 1x1, 3 for 3x3, 5 for 5x5 adjacent tiles
+
+# Neural network parameters
+# Model - FC layers
+dict_fc_features:
+  Phase1: [2048,512,256,64]
+  Phase2: [128,64,32]
+# Batch size
+bs: 5000
+
+# MC Dropout
+MCDropout: True
+MCPasses: 40

Config_Files/AI_Inference_Config_Tiles3x3.yaml

+---
+# Input files
+CSVFile: '../Example_CSV/Data_Example_val.csv'
+ModelName: './pytorch_IRTPNet_Tiles3x3_WithFiltering0.0_MCDropout.h5'
+
+# Output files
+OutputFolder: 'CNN_Output_WithFiltering_MCDropout/'
+OutputSuffix: 'Pred_IRTPNet_Tiles3x3_WithFiltering0.0_MCDropout'
+
+# Data parameters
+NbImageLayers: 124
+NbCorrLayers: 120
+TileSize: 15
+AdjacentTilesDim: 3 # 1 for 1x1, 3 for 3x3, 5 for 5x5 adjacent tiles
+
+# Neural network parameters
+# Model - FC layers
+dict_fc_features:
+  Phase1: [2048,512,256,64]
+  Phase2: [128,64,32]
+# Batch size
+bs: 5000
+
+# MC Dropout
+MCDropout: True
+MCPasses: 40

Config_Files/AI_Inference_Config_Tiles5x5.yaml

+---
+# Input files
+CSVFile: '../Example_CSV/Data_Example_val.csv'
+ModelName: './pytorch_IRTPNet_Tiles5x5_WithFiltering0.0_MCDropout.h5'
+
+# Output files
+OutputFolder: 'CNN_Output_WithFiltering_MCDropout/'
+OutputSuffix: 'Pred_IRTPNet_Tiles5x5_WithFiltering0.0_MCDropout'
+
+# Data parameters
+NbImageLayers: 124
+NbCorrLayers: 120
+TileSize: 15
+AdjacentTilesDim: 5 # 1 for 1x1, 3 for 3x3, 5 for 5x5 adjacent tiles
+
+# Neural network parameters
+# Model - FC layers
+dict_fc_features:
+  Phase1: [2048,512,256,64]
+  Phase2: [128,64,32]
+# Batch size
+bs: 5000
+
+# MC Dropout
+MCDropout: True
+MCPasses: 40

Config_Files/AI_Training_Config_Tiles1x1.yaml

+---
+# Input files
+CSVFile_train: '../Example_CSV/Data_Example_train.csv'
+CSVFile_val: '../Example_CSV/Data_Example_val.csv'
+
+# Output files
+ModelName: './pytorch_IRTPNet_Tiles1x1_WithFiltering0.0_MCDropout.h5'
+LossName: './Loss_IRTPNet_Tiles1x1_WithFiltering0.0_MCDropout.png'
+
+# Data parameters
+NbImageLayers: 124
+NbCorrLayers: 120
+TileSize: 15
+AdjacentTilesDim: 1 # 1 for 1x1, 3 for 3x3, 5 for 5x5 adjacent tiles
+
+# Data sampling parameters
+num_workers: 6
+samples_per_volume: 1000
+queue_length: 6000 # samples_per_volume * num_workers
+
+# Data filtering parameters
+DataFiltering: True
+ConfidenceThreshold: 0.0
+
+# Neural network parameters
+# Model - FC layers
+dict_fc_features:
+  Phase1: [2048,512,256,64]
+  Phase2: [128,64,32]
+# Batch size
+bs: 500
+# Learning rate
+lr: 1.0e-3
+# Number Epochs
+nb_epochs: 15
+

Config_Files/AI_Training_Config_Tiles3x3.yaml

+---
+# Input files
+CSVFile_train: '../Example_CSV/Data_Example_train.csv'
+CSVFile_val: '../Example_CSV/Data_Example_val.csv'
+
+# Output files
+ModelName: './pytorch_IRTPNet_Tiles3x3_WithFiltering0.0_MCDropout.h5'
+LossName: './Loss_IRTPNet_Tiles3x3_WithFiltering0.0_MCDropout.png'
+
+# Data parameters
+NbImageLayers: 124
+NbCorrLayers: 120
+TileSize: 15
+AdjacentTilesDim: 3 # 1 for 1x1, 3 for 3x3, 5 for 5x5 adjacent tiles
+
+# Data sampling parameters
+num_workers: 6
+samples_per_volume: 1000
+queue_length: 6000 # samples_per_volume * num_workers
+
+# Data filtering parameters
+DataFiltering: True
+ConfidenceThreshold: 0.0
+
+# Neural network parameters
+# Model - FC layers
+dict_fc_features:
+  Phase1: [2048,512,256,64]
+  Phase2: [128,64,32]
+# Batch size
+bs: 500
+# Learning rate
+lr: 1.0e-3
+# Number Epochs
+nb_epochs: 15
+

Config_Files/AI_Training_Config_Tiles5x5.yaml

+---
+# Input files
+CSVFile_train: '../Example_CSV/Data_Example_train.csv'
+CSVFile_val: '../Example_CSV/Data_Example_val.csv'
+
+# Output files
+ModelName: './pytorch_IRTPNet_Tiles5x5_WithFiltering0.0_MCDropout.h5'
+LossName: './Loss_IRTPNet_Tiles5x5_WithFiltering0.0_MCDropout.png'
+
+# Data parameters
+NbImageLayers: 124
+NbCorrLayers: 120
+TileSize: 15
+AdjacentTilesDim: 5 # 1 for 1x1, 3 for 3x3, 5 for 5x5 adjacent tiles
+
+# Data sampling parameters
+num_workers: 6
+samples_per_volume: 1000
+queue_length: 6000 # samples_per_volume * num_workers
+
+# Data filtering parameters
+DataFiltering: True
+ConfidenceThreshold: 0.0
+
+# Neural network parameters
+# Model - FC layers
+dict_fc_features:
+  Phase1: [2048,512,256,64]
+  Phase2: [128,64,32]
+# Batch size
+bs: 500
+# Learning rate
+lr: 1.0e-3
+# Number Epochs
+nb_epochs: 15
+

Config_Files/conda_environment.yaml

+name: Elphel_chimera_conda3_Test
+channels:
+  - defaults
+dependencies:
+  - _libgcc_mutex=0.1=main
+  - _openmp_mutex=5.1=1_gnu
+  - ca-certificates=2022.4.26=h06a4308_0
+  - certifi=2022.6.15=py39h06a4308_0
+  - ld_impl_linux-64=2.38=h1181459_1
+  - libffi=3.3=he6710b0_2
+  - libgcc-ng=11.2.0=h1234567_1
+  - libgomp=11.2.0=h1234567_1
+  - libstdcxx-ng=11.2.0=h1234567_1
+  - ncurses=6.3=h5eee18b_3
+  - openssl=1.1.1q=h7f8727e_0
+  - pip=22.1.2=py39h06a4308_0
+  - python=3.9.12=h12debd9_1
+  - readline=8.1.2=h7f8727e_1
+  - setuptools=61.2.0=py39h06a4308_0
+  - sqlite=3.38.5=hc218d9a_0
+  - tk=8.6.12=h1ccaba5_0
+  - tzdata=2022a=hda174b7_0
+  - wheel=0.37.1=pyhd3eb1b0_0
+  - xz=5.2.5=h7f8727e_1
+  - zlib=1.2.12=h7f8727e_2
+  - pip:
+    - --extra-index-url https://download.pytorch.org/whl/cu113
+    - absl-py==1.2.0
+    - cachetools==5.2.0
+    - charset-normalizer==2.1.0
+    - click==8.1.3
+    - cycler==0.11.0
+    - deprecated==1.2.13
+    - fonttools==4.34.4
+    - google-auth==2.9.1
+    - google-auth-oauthlib==0.4.6
+    - grpcio==1.47.0
+    - humanize==4.2.3
+    - idna==3.3
+    - imageio==2.19.5
+    - importlib-metadata==4.12.0
+    - joblib==1.1.0
+    - kiwisolver==1.4.4
+    - markdown==3.4.1
+    - matplotlib==3.5.2
+    - nibabel==4.0.1
+    - numpy==1.23.1
+    - oauthlib==3.2.0
+    - packaging==21.3
+    - pandas==1.4.3
+    - pillow==9.2.0
+    - protobuf==3.19.4
+    - pyasn1==0.4.8
+    - pyasn1-modules==0.2.8
+    - pyparsing==3.0.9
+    - python-dateutil==2.8.2
+    - pytz==2022.1
+    - pyyaml==6.0
+    - requests==2.28.1
+    - requests-oauthlib==1.3.1
+    - rsa==4.9
+    - scikit-learn==1.1.1
+    - scipy==1.8.1
+    - seaborn==0.11.2
+    - simpleitk==2.1.1.2
+    - six==1.16.0
+    - tensorboard==2.9.1
+    - tensorboard-data-server==0.6.1
+    - tensorboard-plugin-wit==1.8.1
+    - threadpoolctl==3.1.0
+    - torch==1.12.0+cu113
+    - torchaudio==0.12.0+cu113
+    - torchio==0.18.83
+    - torchvision==0.13.0+cu113
+    - tqdm==4.64.0
+    - typing-extensions==4.3.0
+    - urllib3==1.26.10
+    - werkzeug==2.1.2
+    - wrapt==1.14.1
+    - zipp==3.8.1

Example_CSV/Data_Example_train.csv

+Combined
+/data/CNN_Input/001_001-ML-AUX-RND-DOFFS0.014_Combined_WithDispLMA.tiff
+/data/CNN_Input/001_002-ML-AUX-RND-DOFFS0.014_Combined_WithDispLMA.tiff
+/data/CNN_Input/001_003-ML-AUX-RND-DOFFS0.014_Combined_WithDispLMA.tiff
+/data/CNN_Input/001_004-ML-AUX-RND-DOFFS0.014_Combined_WithDispLMA.tiff
+/data/CNN_Input/001_005-ML-AUX-RND-DOFFS0.014_Combined_WithDispLMA.tiff

Example_CSV/Data_Example_val.csv

+Combined
+/data/CNN_Input/001_006-ML-AUX-RND-DOFFS0.014_Combined_WithDispLMA.tiff
+/data/CNN_Input/001_007-ML-AUX-RND-DOFFS0.014_Combined_WithDispLMA.tiff
+/data/CNN_Input/001_008-ML-AUX-RND-DOFFS0.014_Combined_WithDispLMA.tiff
+/data/CNN_Input/001_009-ML-AUX-RND-DOFFS0.014_Combined_WithDispLMA.tiff
+/data/CNN_Input/001_010-ML-AUX-RND-DOFFS0.014_Combined_WithDispLMA.tiff

README.md

+README file for package installation
+
+## 1. Installation and requirements 
+
+Installation using conda
+```
+> conda create --name <env_name> --file <conda_environment.yaml>
+> conda activate <env_name>
+OR 
+> source activate <env_name>
+```
+
+General libraries being used:
+  -	python 3.9 
+  -	pillow, numpy, pandas, matplotlib 
+  -	pytorch, torchio, imageio, tensorboard
+  -	scikit-learn, yaml
+
+
+## 2. Updating CSV files to define your datast
+
+Update your CSV files to point to your training and validation datasets.
+  - Please see "Example_CSV/Data_Example_train.csv"
+
+
+## 3. Running the package
+
+###  3.1 DNN training using configuration file
+
+Command line:
+```
+python3 AI_Training.py --config ./Config_Files/AI_Training_Config.yaml
+``` 
+ 
+###  3.2 DNN inference using configuration file
+
+Command line:
+```
+python3 AI_Inference_CSV.py --config ./Config_Files/AI_Inference_Config.yaml --verbose
+```

conda_environment.yaml

+name: Elphel_chimera_conda3_Test
+channels:
+  - defaults
+dependencies:
+  - _libgcc_mutex=0.1=main
+  - _openmp_mutex=5.1=1_gnu
+  - ca-certificates=2022.4.26=h06a4308_0
+  - certifi=2022.6.15=py39h06a4308_0
+  - ld_impl_linux-64=2.38=h1181459_1
+  - libffi=3.3=he6710b0_2
+  - libgcc-ng=11.2.0=h1234567_1
+  - libgomp=11.2.0=h1234567_1
+  - libstdcxx-ng=11.2.0=h1234567_1
+  - ncurses=6.3=h5eee18b_3
+  - openssl=1.1.1q=h7f8727e_0
+  - pip=22.1.2=py39h06a4308_0
+  - python=3.9.12=h12debd9_1
+  - readline=8.1.2=h7f8727e_1
+  - setuptools=61.2.0=py39h06a4308_0
+  - sqlite=3.38.5=hc218d9a_0
+  - tk=8.6.12=h1ccaba5_0
+  - tzdata=2022a=hda174b7_0
+  - wheel=0.37.1=pyhd3eb1b0_0
+  - xz=5.2.5=h7f8727e_1
+  - zlib=1.2.12=h7f8727e_2
+  - pip:
+    - --extra-index-url https://download.pytorch.org/whl/cu113
+    - absl-py==1.2.0
+    - cachetools==5.2.0
+    - charset-normalizer==2.1.0
+    - click==8.1.3
+    - cycler==0.11.0
+    - deprecated==1.2.13
+    - fonttools==4.34.4
+    - google-auth==2.9.1
+    - google-auth-oauthlib==0.4.6
+    - grpcio==1.47.0
+    - humanize==4.2.3
+    - idna==3.3
+    - imageio==2.19.5
+    - importlib-metadata==4.12.0
+    - joblib==1.1.0
+    - kiwisolver==1.4.4
+    - markdown==3.4.1
+    - matplotlib==3.5.2
+    - nibabel==4.0.1
+    - numpy==1.23.1
+    - oauthlib==3.2.0
+    - packaging==21.3
+    - pandas==1.4.3
+    - pillow==9.2.0
+    - protobuf==3.19.4
+    - pyasn1==0.4.8
+    - pyasn1-modules==0.2.8
+    - pyparsing==3.0.9
+    - python-dateutil==2.8.2
+    - pytz==2022.1
+    - pyyaml==6.0
+    - requests==2.28.1
+    - requests-oauthlib==1.3.1
+    - rsa==4.9
+    - scikit-learn==1.1.1
+    - scipy==1.8.1
+    - seaborn==0.11.2
+    - simpleitk==2.1.1.2
+    - six==1.16.0
+    - tensorboard==2.9.1
+    - tensorboard-data-server==0.6.1
+    - tensorboard-plugin-wit==1.8.1
+    - threadpoolctl==3.1.0
+    - torch==1.12.0+cu113
+    - torchaudio==0.12.0+cu113
+    - torchio==0.18.83
+    - torchvision==0.13.0+cu113
+    - tqdm==4.64.0
+    - typing-extensions==4.3.0
+    - urllib3==1.26.10
+    - werkzeug==2.1.2
+    - wrapt==1.14.1
+    - zipp==3.8.1

dataset.py

+
+import pandas as pd
+import torchio as tio
+import torch
+import numpy as np 
+
+# Generate list of torchIO subjects from CSV file
+def GenerateTIOSubjectsList(CSVFile):
+
+	df = pd.read_csv(CSVFile, sep=',')
+	File_list = df['Combined'].tolist()
+	TIOSubjects_list = []
+
+	for idx in range(len(File_list)):		
+		TIOSubject = tio.Subject(
+			Combined = tio.ScalarImage(File_list[idx]),
+			)
+		TIOSubjects_list.append(TIOSubject)
+	return File_list, TIOSubjects_list
+
+
+# split ROI into tiles (3x3, or 5x5)
+# initial shape [bs=2000,1,45,45,120]
+# new shape for 3x3: [bs=2000,9,15,15,120]
+def roi_split(t_roi, tile_size, adjacent_tiles_dim):
+	# t_roi_shape = [B,C,H,W,D]
+	t_roi_shape = t_roi.shape
+	#print('\t t_roi_shape: ',t_roi_shape)
+	# Remove channel layer
+	a = torch.squeeze(t_roi)
+	# Reshape tensor [bs=2000,3,15,3,15,120]
+	b = a.reshape(t_roi_shape[0],adjacent_tiles_dim,tile_size,adjacent_tiles_dim,tile_size,-1) 
+	# Swap axes [bs=2000,3,3,15,15,120]
+	c = b.swapaxes(2,3)
+	# Combine channels [bs=2000,3x3,15,15,120]
+	d = c.reshape(t_roi_shape[0],adjacent_tiles_dim*adjacent_tiles_dim,tile_size,tile_size,-1)
+	# Remove last dimension of size 1 when needed (D=1 for TargetDisparity)
+	e = torch.squeeze(d,axis=4)
+	return e
+
+
+# Prepare data as multiple inputs to network (tensors)
+# Perform data filtering if enabled, using Confidence and DispLMA maps
+def prepare_data_withfiltering(t_input, nb_image_layers, nb_corr_layers, tile_size, adjacent_tiles_dim, is_filtering=0, confidence_threshold=0.0):
+	t_input_Corr = t_input[:,:,:,:,0:nb_corr_layers]
+	t_input_TargetDisp = t_input[:,:,:,:,-4]
+	t_GroundTruth = t_input[:,:,:,:,-3]
+	t_Confidence = t_input[:,:,:,:,-2]
+	t_DispLMA = t_input[:,:,:,:,-1]
+	
+	# print('t_input.type: ', t_input.type())
+	# # torch.Size([2000, 1, 45, 45, 122])
+	# print('t_input.shape: ', t_input.shape)
+	# print('t_input_Corr.shape: ', t_input_Corr.shape)
+	# print('t_input_TargetDisp.shape: ', t_input_TargetDisp.shape)
+	# print('t_GroundTruth.shape: ', t_GroundTruth.shape)
+
+	# Generate tiles when needed
+	if (adjacent_tiles_dim == 1):
+		t_input_Corr_tiles = t_input_Corr
+		t_input_TargetDisp_tiles = t_input_TargetDisp
+		t_GroundTruth_tiles = t_GroundTruth
+		t_Confidence_tiles = t_Confidence
+		t_DispLMA_tiles = t_DispLMA
+	else:
+		# Split t_input into neighboring tiles
+		t_input_Corr_tiles = roi_split(t_input_Corr, tile_size, adjacent_tiles_dim)
+		# # torch.Size([2000, 9, 15, 15, 120])
+		# print('t_input_Corr_tiles.shape: ', t_input_Corr_tiles.shape)
+
+		t_input_TargetDisp_tiles = roi_split(t_input_TargetDisp, tile_size, adjacent_tiles_dim)
+		# print('t_input_TargetDisp_tiles.shape: ', t_input_TargetDisp_tiles.shape)
+		# # torch.Size([2000, 9, 15, 15])
+		t_GroundTruth_tiles = roi_split(t_GroundTruth, tile_size, adjacent_tiles_dim)
+		t_Confidence_tiles = roi_split(t_Confidence, tile_size, adjacent_tiles_dim)
+		t_DispLMA_tiles = roi_split(t_DispLMA, tile_size, adjacent_tiles_dim)
+
+
+	# Generate input_TargetDisp_tiles_real, t_GroundTruth_tiles_real, scaling back to 62x78 pixels
+	t_input_TargetDisp_tiles_real = t_input_TargetDisp_tiles[:,:,::tile_size,::tile_size]
+	t_GroundTruth_tiles_real = t_GroundTruth_tiles[:,:,::tile_size,::tile_size]
+	t_Confidence_tiles_real = t_Confidence_tiles[:,:,::tile_size,::tile_size]
+	t_DispLMA_tiles_real = t_DispLMA_tiles[:,:,::tile_size,::tile_size]
+	
+	# # torch.Size([2000, 9, 1, 1])
+	# print('\nt_input_TargetDisp_tiles_real.shape: ', t_input_TargetDisp_tiles_real.shape)
+	# print('t_GroundTruth_tiles_real.shape: ', t_GroundTruth_tiles_real.shape)
+	# print('t_Confidence_tiles_real.shape: ', t_Confidence_tiles_real.shape)
+	# print('t_DispLMA_tiles_real.shape: ', t_DispLMA_tiles_real.shape)
+
+
+	# - - - - - - - - 
+	# Data filtering
+	# print('Data filtering...')
+	if is_filtering:
+		t_DispLMA_tiles_real_Mask = ~torch.isnan(t_DispLMA_tiles_real)
+		t_Confidence_tiles_real_Mask = torch.where(t_Confidence_tiles_real >= confidence_threshold, 1, 0)
+		t_Mask = torch.logical_and(t_DispLMA_tiles_real_Mask, t_Confidence_tiles_real_Mask)
+		t_Mask = torch.squeeze(t_Mask)
+		if (adjacent_tiles_dim != 1):
+			t_Mask = torch.all(t_Mask, axis=1)
+		# print('t_Mask.shape: ', t_Mask.shape)
+		# print('t_Mask[:20]: ', t_Mask[:20,...])
+
+		t_input_Corr_tiles_filtered = t_input_Corr_tiles[t_Mask]
+		t_input_TargetDisp_tiles_real_filtered = t_input_TargetDisp_tiles_real[t_Mask]
+		t_GroundTruth_tiles_real_filtered = t_GroundTruth_tiles_real[t_Mask]
+		# print('t_input_Corr_tiles_filtered.shape: ', t_input_Corr_tiles_filtered.shape)
+		# print('t_input_TargetDisp_tiles_real_filtered.shape: ', t_input_TargetDisp_tiles_real_filtered.shape)
+	else:
+		t_input_Corr_tiles_filtered = t_input_Corr_tiles
+		t_input_TargetDisp_tiles_real_filtered = t_input_TargetDisp_tiles_real
+		t_GroundTruth_tiles_real_filtered = t_GroundTruth_tiles_real		
+
+	# Define center tile for GroundTruth and TargetDisp maps
+	if (adjacent_tiles_dim == 3):
+		IndexCenterTile = 4
+	elif (adjacent_tiles_dim == 5):
+		IndexCenterTile = 12
+	else:
+		IndexCenterTile = 0
+	t_input_TargetDisp_real_filtered_center = t_input_TargetDisp_tiles_real_filtered[:,IndexCenterTile,...]
+	t_GroundTruth_real_filtered_center = t_GroundTruth_tiles_real_filtered[:,IndexCenterTile,...]
+	
+	# print('t_GroundTruth_tiles.shape: ', t_GroundTruth_tiles.shape)
+	# print('t_GroundTruth_tiles_real.shape: ', t_GroundTruth_tiles_real.shape)
+	# print('t_GroundTruth_tiles_real_filtered.shape: ', t_GroundTruth_tiles_real_filtered.shape)
+	# print('t_GroundTruth_real_filtered_center.shape: ', t_GroundTruth_real_filtered_center.shape)
+
+	# print('t_input_TargetDisp_tiles.shape: ', t_input_TargetDisp_tiles.shape)
+	# print('t_input_TargetDisp_tiles_real.shape: ', t_input_TargetDisp_tiles_real.shape)
+	# print('t_input_TargetDisp_tiles_real_filtered.shape: ', t_input_TargetDisp_tiles_real_filtered.shape)
+	# print('t_input_TargetDisp_real_filtered_center.shape: ', t_input_TargetDisp_real_filtered_center.shape)
+
+	return t_input_Corr_tiles_filtered, t_input_TargetDisp_real_filtered_center, t_GroundTruth_real_filtered_center
+
+# Initialize TorchIO GridSampler variables
+# Generate patch_overlap based on adjacent_tiles_dim
+def initialize_gridsampler_variables(nb_image_layers, tile_size, adjacent_tiles_dim, padding_mode=None):
+	# Define patch_size
+	patch_size = (adjacent_tiles_dim * tile_size, adjacent_tiles_dim * tile_size, nb_image_layers)
+
+	# Define padding_mode
+	#padding_mode = 'symmetric'
+
+	# Define patch_overlap
+	if (adjacent_tiles_dim == 1):
+		patch_overlap = (0,0,0)
+	elif (adjacent_tiles_dim == 3):
+		# patch_overlap = (30,30,0)
+		patch_overlap = (2*tile_size,2*tile_size,0)
+	elif (adjacent_tiles_dim == 5):
+		# patch_overlap = (60,60,0)
+		patch_overlap = (4*tile_size,4*tile_size,0)
+	else:
+		print("Error initialize_gridsampler_variables - adjacent_tiles_dim")
+		sys.exit()	
+	# print('patch_size: ',patch_size)
+	# print('patch_overlap: ',patch_overlap)
+	# print('padding_mode: ',padding_mode)
+
+	padding_mode = padding_mode
+
+	return patch_size, patch_overlap, padding_mode
+
+
+# Initialize TorchIO uniform Sampler variables
+# patch_overlap = (0,0,0) # Not directly used
+# patch overlap is generated by the random locations
+def initialize_uniformsampler_variables(nb_image_layers, tile_size, adjacent_tiles_dim, padding_mode=None):
+	# Define patch_size
+	patch_size = (adjacent_tiles_dim * tile_size, adjacent_tiles_dim * tile_size, nb_image_layers)
+
+	# Define patch_overlap
+	patch_overlap = (0,0,0)
+
+	# Define padding_mode
+	#padding_mode = 'symmetric'
+	padding_mode = padding_mode
+	
+	# print('patch_size: ',patch_size)
+	# print('patch_overlap: ',patch_overlap)
+	# print('padding_mode: ',padding_mode)
+
+	return patch_size, patch_overlap, padding_mode
+
+
+
+# Generate TorchIO aggregator patch_location for prediction
+# Example - Input patch location for Tiles 5x5 = [   0,    0,    0,   75,   75,  122]
+# Example - Output patch location for Tiles5x5 = [ 2,  2,  0,  3,  3,  1]
+# - Use CenterTile location
+# - Divide by TileSize
+# - Depth = 1
+def prediction_patch_location(input_location, tile_size, adjacent_tiles_dim):
+
+	if (adjacent_tiles_dim == 1):
+		output_location = input_location
+	elif (adjacent_tiles_dim == 3):
+		#CenterTile_Update = torch.tensor([15,15,0,-15,-15,0], dtype=torch.int64)
+		CenterTile_Update = torch.tensor([tile_size,tile_size,0,-tile_size,-tile_size,0], dtype=torch.int64)
+		output_location = input_location + CenterTile_Update[None,:]
+	elif (adjacent_tiles_dim == 5):
+		#CenterTile_Update = torch.tensor([30,30,0,-30,-30,0], dtype=torch.int64)
+		CenterTile_Update = torch.tensor([2*tile_size,2*tile_size,0,-2*tile_size,-2*tile_size,0], dtype=torch.int64)
+		output_location = input_location + CenterTile_Update[None,:]
+	else:
+		print("Error prediction_patch_location - adjacent_tiles_dim")
+		sys.exit()	
+	
+	# print('\t\t output_location shape: ', output_location.shape)
+	# print('\t\t output_location: ', output_location)
+
+	# Divide by tile_size
+	output_location = torch.div(output_location, tile_size, rounding_mode='floor')
+
+	# Update depth to 1 (from 3D volume to 2D image)
+	output_location[:,-1]=1
+
+	# print('\t\t output_location shape: ', output_location.shape)
+	# print('\t\t output_location: ', output_location)
+
+	return output_location
+

network.py

+
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+
+class MySubNetworkPhase1(nn.Module):
+	def __init__(self, nb_image_layers, tile_size, adjacent_tiles_dim, list_fc_features):
+		super().__init__()
+
+		self.nb_image_layers = nb_image_layers
+		self.tile_size = tile_size
+		self.adjacent_tiles_dim = adjacent_tiles_dim
+
+		#print('SUBNETPHASE1 - nb_image_layers',self.nb_image_layers)
+		#print('SUBNETPHASE1 - adjacent_tiles_dim',self.adjacent_tiles_dim)
+		
+		self.list_fc_features = list_fc_features
+
+		self.flatten1 = nn.Flatten()
+
+		nb_input_features = self.nb_image_layers * self.tile_size * self.tile_size # 120*15*15 #27000
+		#print('SUBNETPHASE1 - nb_input_features',nb_input_features)
+
+		self.fc1 = nn.Linear(nb_input_features, self.list_fc_features[0])
+		self.BN1 = torch.nn.BatchNorm1d(self.list_fc_features[0])
+		#self.drop1 = nn.Dropout(p=0.25)
+
+		self.fc2 = nn.Linear(self.list_fc_features[0], self.list_fc_features[1])
+		self.BN2 = torch.nn.BatchNorm1d(self.list_fc_features[1])
+		#self.drop2 = nn.Dropout(p=0.25)
+
+		self.fc3 = nn.Linear(self.list_fc_features[1], self.list_fc_features[2])
+		self.BN3 = torch.nn.BatchNorm1d(self.list_fc_features[2])
+		#self.drop3 = nn.Dropout(p=0.25)
+
+		self.fc4 = nn.Linear(self.list_fc_features[2], self.list_fc_features[3])
+		#self.BN4 = torch.nn.BatchNorm1d(self.list_fc_features[3])
+		#self.drop4 = nn.Dropout(p=0.25)
+
+	def forward(self, x1):
+		x1 = self.flatten1(x1)
+
+		x = self.fc1(x1)
+		x = F.relu(x)
+		x = self.BN1(x)
+		#x = self.drop1(x)
+
+		x = self.fc2(x)
+		x = F.relu(x)
+		x = self.BN2(x)
+		#x = self.drop2(x)
+
+		x = self.fc3(x)
+		x = F.relu(x)
+		x = self.BN3(x)
+		#x = self.drop3(x)
+
+		x = self.fc4(x)
+		out = F.relu(x)
+		#out = self.BN4(out)
+		#out = self.drop4(out)
+
+		return out
+
+
+# sub-Network - Phase2
+class MySubNetworkPhase2(nn.Module):
+	def __init__(self, fc_inputfeatures, list_fc_features):
+		super().__init__()
+		
+		# Input features after concatenation e.g. [3x3x64] or [5x5x64] 
+		self.fc_inputfeatures = fc_inputfeatures
+
+		#list_nbfeatures = [128,64,32]
+		self.list_fc_features = list_fc_features
+
+		self.BN0 = torch.nn.BatchNorm1d(self.fc_inputfeatures)
+		self.drop0 = nn.Dropout(p=0.25)
+
+		self.fc1 = nn.Linear(self.fc_inputfeatures, self.list_fc_features[0])
+		self.BN1 = torch.nn.BatchNorm1d(self.list_fc_features[0])
+		self.drop1 = nn.Dropout(p=0.20)
+
+		self.fc2 = nn.Linear(self.list_fc_features[0], self.list_fc_features[1])
+		self.BN2 = torch.nn.BatchNorm1d(self.list_fc_features[1])
+		self.drop2 = nn.Dropout(p=0.10)
+
+		self.fc3 = nn.Linear(self.list_fc_features[1], self.list_fc_features[2])
+		self.BN3 = torch.nn.BatchNorm1d(self.list_fc_features[2])
+		#self.drop3 = nn.Dropout(p=0.25)
+
+		self.fc4 = nn.Linear(self.list_fc_features[2], 1)
+
+		self.flatten2 = nn.Flatten()
+
+	def forward(self, x, x2):
+
+		x = self.BN0(x)
+		x = self.drop0(x)
+
+		x = self.fc1(x)
+		x = F.relu(x)
+		x = self.BN1(x)
+		x = self.drop1(x)
+
+		x = self.fc2(x)
+		x = F.relu(x)
+		x = self.BN2(x)
+		x = self.drop2(x)
+
+		x = self.fc3(x)
+		x = F.relu(x)
+		x = self.BN3(x)
+		#x = self.drop3(x)
+
+		x = self.fc4(x)
+	
+		x2 = self.flatten2(x2)
+		out = torch.add(x,x2)
+
+		return out
+
+
+# Parallel network for neighboring tiles (e.g. 3x3, 5x5)
+#  - Phase1 : dynamic parallel sub-networks with FC layers (e.g. 3x3 or 5x5)
+#  - Concatenating 3x3 or 5x5 features
+#  - Phase 2 - single sub-network with FC layers
+class MyParallelNetwork(nn.Module):
+	def __init__(self, nb_image_layers, tile_size, adjacent_tiles_dim, dict_fc_features):
+		super().__init__()
+		
+		self.nb_image_layers = nb_image_layers
+		self.tile_size = tile_size
+		self.adjacent_tiles_dim = adjacent_tiles_dim
+		
+		# Number of sub-networks: 5x5
+		self.nb_subnetworks = self.adjacent_tiles_dim * self.adjacent_tiles_dim
+		
+		# FC features
+		self.dict_fc_features = dict_fc_features
+		self.Phase2_InputFeatures = self.adjacent_tiles_dim * self.adjacent_tiles_dim * self.dict_fc_features['Phase1'][-1]
+
+
+		#print('NETWORK - nb_image_layers',self.nb_image_layers)
+		#print('NETWORK - adjacent_tiles_dim',self.adjacent_tiles_dim)
+		#print('NETWORK - nb_subnetworks',self.nb_subnetworks)
+
+		# define ModuleList of subnetworks
+		self.Phase1_subnetworks = nn.ModuleList([MySubNetworkPhase1(self.nb_image_layers, self.tile_size, self.adjacent_tiles_dim, self.dict_fc_features['Phase1']) for i in range(self.nb_subnetworks)])
+		
+		self.Phase2_net = MySubNetworkPhase2(self.Phase2_InputFeatures, self.dict_fc_features['Phase2'])
+
+
+	def forward(self, x1, x2):
+		# Phase 1 - Parallel subnets
+		# x1 & x2 = list of 5x5 neighboring tiles
+		outputs_subnetworks = [Phase1_net(x1[:,i,...]) for i, Phase1_net in enumerate(self.Phase1_subnetworks)]
+		#print('NETWORK - len outputs_subnetworks',len(outputs_subnetworks))
+		#print('NETWORK - outputs_subnetworks[0] shape',outputs_subnetworks[0].shape)
+
+		# Concatenating outputs of subnets
+		out_Phase1 = torch.cat((outputs_subnetworks), dim = 1)
+		#print('NETWORK - out_Phase1 shape',out_Phase1.shape)
+
+		# Phase 2 - FC layers
+		out_Phase2 = self.Phase2_net(out_Phase1, x2)
+		
+		return out_Phase2
+

sampler.py

+import torch
+from torchio.data.subject import Subject
+from torchio.data.sampler import RandomSampler
+from typing import Generator
+import numpy as np
+
+
+class MyUniformSampler(RandomSampler):
+	"""Randomly extract patches from a volume with uniform probability.
+	Args:
+		patch_size: See :class:`~torchio.data.PatchSampler`.
+	"""
+
+	def __init__(self, patch_size, tile_size):
+		super().__init__(patch_size)
+		self.tile_size = tile_size
+
+	def get_probability_map(self, subject: Subject) -> torch.Tensor:
+		return torch.ones(1, *subject.spatial_shape)
+
+	def _generate_patches(
+			self,
+			subject: Subject,
+			num_patches: int = None,
+			) -> Generator[Subject, None, None]:
+		valid_range = subject.spatial_shape - self.patch_size
+
+		patches_left = num_patches if num_patches is not None else True
+		# Random location using tile_size (multiple of tile_size)
+		while patches_left:
+			index_ini = [
+				self.tile_size * torch.randint(x//self.tile_size + 1, (1,)).item()
+				for x in valid_range
+			]
+			index_ini_array = np.asarray(index_ini)
+			yield self.extract_patch(subject, index_ini_array)
+			if num_patches is not None:
+				patches_left -= 1

utils.py

+
+import numpy as np 
+import matplotlib.pyplot as plt
+import torch
+
+def imshow(inp, title=None):
+	"""Imshow for Tensor."""
+	# inp = inp.numpy().transpose((1, 2, 0))
+	# mean = np.array([0.485, 0.456, 0.406])
+	# std = np.array([0.229, 0.224, 0.225])
+	# inp = std * inp + mean
+	# inp = np.clip(inp, 0, 1)
+
+	print('imshow inp.shape: ',inp.shape)
+	# Transpose axes for matplotlib from HWC to CHW (Channel, Height, Width)
+	inp = inp.numpy().transpose((1, 2, 0))
+	print('imshow inp.shape: ',inp.shape)
+
+	fig = plt.subplots()
+	plt.imshow(inp,cmap='gray')
+	if title is not None:
+		plt.title(title)
+	plt.pause(0.001)  # pause a bit so that plots are updated