research-rainfallradar/aimodel/src/deeplabv3_plus_test_rainfall.py

#!/usr/bin/env python3
# @source https://keras.io/examples/vision/deeplabv3_plus/
# Required dataset: https://drive.google.com/uc?id=1B9A9UCJYMwTL4oBEo4RZfbMZMaZhKJaz [instance-level-human-parsing.zip]

from datetime import datetime
from loguru import logger

from lib.ai.helpers.summarywriter import summarywriter
from lib.ai.components.CallbackCustomModelCheckpoint import CallbackCustomModelCheckpoint

import os
import io
import math
import json
# import cv2 # optional import below in get_overlay
import numpy as np
from glob import glob
from scipy.io import loadmat
import matplotlib.pyplot as plt

import tensorflow as tf

import lib.primitives.env
from lib.dataset.dataset_mono import dataset_mono, dataset_mono_predict
from lib.ai.components.LossCrossEntropyDice import LossCrossEntropyDice
from lib.ai.components.MetricDice import metric_dice_coefficient as dice_coefficient
from lib.ai.components.MetricSensitivity import make_sensitivity as sensitivity
from lib.ai.components.MetricSpecificity import specificity
from lib.ai.components.MetricMeanIoU import make_one_hot_mean_iou as mean_iou
from lib.ai.components.CallbackExtraValidation import CallbackExtraValidation

time_start = datetime.now()
logger.info(f"Starting at {str(datetime.now().isoformat())}")


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IMAGE_SIZE = env.read("IMAGE_SIZE", int, 128)  # was 512; 128 is the highest power of 2 that fits the data
BATCH_SIZE = env.read("BATCH_SIZE", int, 32)
NUM_CLASSES = 2
DIR_RAINFALLWATER = env.read("DIR_RAINFALLWATER", str)
PATH_HEIGHTMAP = env.read("PATH_HEIGHTMAP", str)
PATH_COLOURMAP = env.read("PATH_COLOURMAP", str)
PARALLEL_READS = env.read("PARALLEL_READS", float, 1.5)
STEPS_PER_EPOCH = env.read("STEPS_PER_EPOCH", int, None)
REMOVE_ISOLATED_PIXELS = env.read("NO_REMOVE_ISOLATED_PIXELS", bool, True)
EPOCHS = env.read("EPOCHS", int, 25)
LOSS = env.read("LOSS", str, "cross-entropy-dice")  # other possible values: cross-entropy
DICE_LOG_COSH = env.read("DICE_LOG_COSH", bool, False)
LEARNING_RATE = env.read("LEARNING_RATE", float, 0.00001)
WATER_THRESHOLD = env.read("WATER_THRESHOLD", float, 0.1)
UPSAMPLE = env.read("UPSAMPLE", int, 2)
SPLIT_VALIDATE = env.read("SPLIT_VALIDATE", float, 0.2)
SPLIT_TEST = env.read("SPLIT_TEST", float, 0)
# NOTE: RANDSEED is declared and handled in src/lib/dataset/primitives/shuffle.py

STEPS_PER_EXECUTION = env.read("STEPS_PER_EXECUTION", int, 1)
JIT_COMPILE = env.read("JIT_COMPILE", bool, True)
DIR_OUTPUT = env.read("DIR_OUTPUT", str, f"output/{datetime.utcnow().date().isoformat()}_deeplabv3plus_rainfall_TEST")
PATH_CHECKPOINT = env.read("PATH_CHECKPOINT", str, None)
PREDICT_COUNT = env.read("PREDICT_COUNT", int, 25)
PREDICT_AS_ONE = env.read("PREDICT_AS_ONE", bool, False)

# ~~~

env.val_dir_exists(os.path.join(DIR_OUTPUT, "checkpoints"), create=True)

# ~~~

logger.info("DeepLabV3+ rainfall radar TEST")
env.print_all(False)
# for env_name in [ "BATCH_SIZE","NUM_CLASSES", "DIR_RAINFALLWATER", "PATH_HEIGHTMAP", "PATH_COLOURMAP", "STEPS_PER_EPOCH", "PARALLEL_READS", "REMOVE_ISOLATED_PIXELS", "EPOCHS", "LOSS", "LEARNING_RATE", "DIR_OUTPUT", "PATH_CHECKPOINT", "PREDICT_COUNT", "DICE_LOG_COSH", "WATER_THRESHOLD", "UPSAMPLE", "STEPS_PER_EXECUTION", "JIT_COMPILE", "PREDICT_AS_ONE" ]:
# 	logger.info(f"> {env_name} {str(globals()[env_name])}")


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if not PREDICT_AS_ONE:
	dataset_train, dataset_validate, dataset_test = dataset_mono(
		dirpath_input=DIR_RAINFALLWATER,
		batch_size=BATCH_SIZE,
		water_threshold=WATER_THRESHOLD,
		rainfall_scale_up=2, # done BEFORE cropping to the below size
		output_size=IMAGE_SIZE,
		input_size="same",
		filepath_heightmap=PATH_HEIGHTMAP,
		do_remove_isolated_pixels=REMOVE_ISOLATED_PIXELS,
		parallel_reads_multiplier=PARALLEL_READS,
		percentage_validate=SPLIT_VALIDATE,
		percentage_test=SPLIT_TESTs
	)

	logger.info("Train Dataset:", dataset_train)
	logger.info("Validation Dataset:", dataset_validate)
	logger.info("Test Dataset:", dataset_test)
else:
	dataset_train = dataset_mono_predict(
		dirpath_input=DIR_RAINFALLWATER,
		batch_size=BATCH_SIZE,
		water_threshold=WATER_THRESHOLD,
		rainfall_scale_up=2,  # done BEFORE cropping to the below size
		output_size=IMAGE_SIZE,
		input_size="same",
		filepath_heightmap=PATH_HEIGHTMAP,
		do_remove_isolated_pixels=REMOVE_ISOLATED_PIXELS
	)
	logger.info("Dataset AS_ONE:", dataset_train)

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if PATH_CHECKPOINT is None:
	def convolution_block(
		block_input,
		num_filters=256,
		kernel_size=3,
		dilation_rate=1,
		padding="same",
		use_bias=False,
	):
		x = tf.keras.layers.Conv2D(
			num_filters,
			kernel_size=kernel_size,
			dilation_rate=dilation_rate,
			padding="same",
			use_bias=use_bias,
			kernel_initializer=tf.keras.initializers.HeNormal(),
		)(block_input)
		x = tf.keras.layers.BatchNormalization()(x)
		return tf.nn.relu(x)


	def DilatedSpatialPyramidPooling(dspp_input):
		dims = dspp_input.shape
		x = tf.keras.layers.AveragePooling2D(pool_size=(dims[-3], dims[-2]))(dspp_input)
		x = convolution_block(x, kernel_size=1, use_bias=True)
		out_pool = tf.keras.layers.UpSampling2D(
			size=(dims[-3] // x.shape[1], dims[-2] // x.shape[2]), interpolation="bilinear",
		)(x)
		
		out_1 = convolution_block(dspp_input, kernel_size=1, dilation_rate=1)
		out_6 = convolution_block(dspp_input, kernel_size=3, dilation_rate=6)
		out_12 = convolution_block(dspp_input, kernel_size=3, dilation_rate=12)
		out_18 = convolution_block(dspp_input, kernel_size=3, dilation_rate=18)
		
		x = tf.keras.layers.Concatenate(axis=-1)([out_pool, out_1, out_6, out_12, out_18])
		output = convolution_block(x, kernel_size=1)
		return output
	
	
	def DeeplabV3Plus(image_size, num_classes, num_channels=3, backbone="resnet", upsample=2):
		model_input = tf.keras.Input(shape=(image_size, image_size, num_channels))
		if upsample > 1:
			logger.info(f"[DeepLabV3+] Upsample enabled @ {upsample}x")
			x = tf.keras.layers.UpSampling2D(size=2)(model_input)
		else:
			logger.info(f"[DeepLabV3+] Upsample disabled")
			x = model_input
		
		match backbone:
			case "resnet":
				backbone = tf.keras.applications.ResNet50(
					weights="imagenet" if num_channels == 3 else None,
					include_top=False, input_tensor=x
				)
			case _:
				raise Exception(f"Error: Unknown backbone {backbone}")
		
		x = backbone.get_layer("conv4_block6_2_relu").output
		x = DilatedSpatialPyramidPooling(x)
		
		factor = 4 if upsample == 2 else 8 # else: upsample == 1. other values are not supported yet because maths
		input_a = tf.keras.layers.UpSampling2D(
			size=(image_size // factor // x.shape[1] * 2, image_size // factor // x.shape[2] * 2), # <--- UPSAMPLE after pyramid
			interpolation="bilinear",
		)(x)
		input_b = backbone.get_layer("conv2_block3_2_relu").output
		input_b = convolution_block(input_b, num_filters=48, kernel_size=1)

		x = tf.keras.layers.Concatenate(axis=-1)([input_a, input_b])
		x = convolution_block(x)
		x = convolution_block(x)
		x = tf.keras.layers.UpSampling2D(
			size=(image_size // x.shape[1], image_size // x.shape[2]), # <--- UPSAMPLE at end
			interpolation="bilinear",
		)(x)
		model_output = tf.keras.layers.Conv2D(num_classes, kernel_size=(1, 1), padding="same")(x)
		return tf.keras.Model(inputs=model_input, outputs=model_output)

	model = DeeplabV3Plus(
		image_size=IMAGE_SIZE,
		num_classes=NUM_CLASSES,
		upsample=UPSAMPLE,
		num_channels=8
	)
	summarywriter(model, os.path.join(DIR_OUTPUT, "summary.txt"))
else:
	model = tf.keras.models.load_model(PATH_CHECKPOINT, custom_objects={
		# Tell Tensorflow about our custom layers so that it can deserialise models that use them
		"LossCrossEntropyDice": LossCrossEntropyDice,
		"metric_dice_coefficient": dice_coefficient,
		"sensitivity": sensitivity,
		"specificity": specificity,
		"one_hot_mean_iou": mean_iou
	})


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def plot_metric(train, val, name, dir_output):
	plt.plot(train, label=f"train_{name}")
	plt.plot(val, label=f"val_{name}")
	plt.title(name)
	plt.xlabel("epoch")
	plt.ylabel(name)
	plt.savefig(os.path.join(dir_output, f"{name}.png"))
	plt.close()

if PATH_CHECKPOINT is None:
	loss_fn = None
	if LOSS == "cross-entropy-dice":
		loss_fn = LossCrossEntropyDice(log_cosh=DICE_LOG_COSH)
	elif LOSS == "cross-entropy":
		loss_fn = tf.keras.losses.SparseCategoricalCrossentropy(from_logits=True)
	else:
		raise Exception(f"Error: Unknown loss function '{LOSS}' (possible values: cross-entropy, cross-entropy-dice).")
	
	model.compile(
		optimizer=tf.keras.optimizers.Adam(learning_rate=LEARNING_RATE),
		loss=loss_fn,
		metrics=[
			"accuracy",
			dice_coefficient,
			mean_iou(),
			sensitivity(), # How many true positives were accurately predicted
			specificity # How many true negatives were accurately predicted?
			# TODO: Add IoU, F1, Precision, Recall,  here. 
		],
		steps_per_execution=STEPS_PER_EXECUTION,
		jit_compile=JIT_COMPILE
	)
	logger.info(">>> Beginning training")
	history = model.fit(dataset_train,
		validation_data=dataset_validate,
		# test_data=dataset_test, # Nope, it doesn't have a param like this so it's time to do this the *hard* way
		epochs=EPOCHS,
		callbacks=[
			CallbackExtraValidation(model, {
				"test": dataset_test # Can be None because it handles that
			}),
			tf.keras.callbacks.CSVLogger(
				filename=os.path.join(DIR_OUTPUT, "metrics.tsv"),
				separator="\t"
			),
			CallbackCustomModelCheckpoint(
				model_to_checkpoint=model,
				filepath=os.path.join(
					DIR_OUTPUT,
					"checkpoints",
					"checkpoint_e{epoch:d}_loss{loss:.3f}.hdf5"
				),
				monitor="loss"
			),
		],
		steps_per_epoch=STEPS_PER_EPOCH,
	)
	logger.info(">>> Training complete")
	logger.info(">>> Plotting graphs")
	
	plot_metric(history.history["loss"], history.history["val_loss"], "loss", DIR_OUTPUT)
	plot_metric(history.history["accuracy"], history.history["val_accuracy"], "accuracy", DIR_OUTPUT)
	plot_metric(history.history["metric_dice_coefficient"], history.history["val_metric_dice_coefficient"], "dice", DIR_OUTPUT)
	plot_metric(history.history["one_hot_mean_iou"], history.history["val_one_hot_mean_iou"], "mean iou", DIR_OUTPUT)
	plot_metric(history.history["sensitivity"], history.history["val_sensitivity"], "sensitivity", DIR_OUTPUT)
	plot_metric(history.history["specificity"], history.history["val_specificity"], "specificity", DIR_OUTPUT)
	

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# Loading the Colormap
colormap = loadmat(
	PATH_COLOURMAP
)["colormap"]
colormap = colormap * 100
colormap = colormap.astype(np.uint8)


def infer(model, image_tensor, do_argmax=True):
	predictions = model.predict(tf.expand_dims((image_tensor), axis=0))
	predictions = tf.squeeze(predictions)
	return predictions


def decode_segmentation_masks(mask, colormap, n_classes):
	r = np.zeros_like(mask).astype(np.uint8)
	g = np.zeros_like(mask).astype(np.uint8)
	b = np.zeros_like(mask).astype(np.uint8)
	for l in range(0, n_classes):
		idx = mask == l
		r[idx] = colormap[l, 0]
		g[idx] = colormap[l, 1]
		b[idx] = colormap[l, 2]
	rgb = np.stack([r, g, b], axis=2)
	return rgb


def get_overlay(image, coloured_mask):
	global cv2
	# import cv2 only when used, since it might not be available and this function isn't currently used (was prob something I dropped halfway through writing 'cause I got distracted)
	if not cv2:
		cv2 = __import__("cv2") 
	image = tf.keras.preprocessing.image.array_to_img(image)
	image = np.array(image).astype(np.uint8)
	overlay = cv2.addWeighted(image, 0.35, coloured_mask, 0.65, 0)
	return overlay


def plot_samples_matplotlib(filepath, display_list):
	plt.figure(figsize=(16, 8))
	for i in range(len(display_list)):
		plt.subplot(2, math.ceil(len(display_list) / 2), i+1)
		if display_list[i].shape[-1] == 3:
			plt.imshow(tf.keras.preprocessing.image.array_to_img(display_list[i]))
		else:
			plt.imshow(display_list[i])
			plt.colorbar()
	plt.savefig(filepath, dpi=200)

def save_samples(filepath, save_list):
	handle = io.open(filepath, "a")
	json.dump(save_list, handle)
	handle.write("\n")
	handle.close()

def plot_predictions(filepath, input_items, colormap, model):
	filepath_jsonl = filepath.replace("_$$", "").replace(".png", ".jsonl")
	if os.path.exists(filepath_jsonl):
		os.truncate(filepath_jsonl, 0)
	
	i = 0
	for input_pair in input_items:
		prediction_mask = infer(image_tensor=input_pair[0], model=model)
		prediction_mask_argmax = tf.argmax(prediction_mask, axis=2)
		# label_colourmap = decode_segmentation_masks(input_pair[1], colormap, 2)
		prediction_colormap = decode_segmentation_masks(prediction_mask_argmax, colormap, 2)
		
		# print("DEBUG:plot_predictions INFER", str(prediction_mask.numpy().tolist()).replace("], [", "],\n["))
		
		plot_samples_matplotlib(
			filepath.replace("$$", str(i)),
			[
				# input_tensor,
				tf.math.reduce_max(input_pair[0][:,:,:-1], axis=-1), # rainfall only
				input_pair[0][:,:,-1], # heightmap
				input_pair[1], #label_colourmap,
				prediction_mask[:,:,1],
				prediction_colormap
			]
		)
		
		save_samples(
			filepath_jsonl,
			prediction_mask.numpy().tolist()
		)
		i += 1

def get_from_batched(dataset, count):
	result = []
	for batched in dataset:
		items_input = tf.unstack(batched[0], axis=0)
		items_label = tf.unstack(batched[1], axis=0)
		for item in zip(items_input, items_label):
			result.append(item)
			if len(result) >= count:
				return result


plot_predictions(
	os.path.join(DIR_OUTPUT, "predict_train_$$.png"),
	get_from_batched(dataset_train, PREDICT_COUNT),
	colormap,
	model=model
)
if not PREDICT_AS_ONE:
	plot_predictions(
		os.path.join(DIR_OUTPUT, "predict_validate_$$.png"),
		get_from_batched(dataset_validate, PREDICT_COUNT),
		colormap,
		model=model
	)
	if dataset_test is not None:
		plot_predictions(
			os.path.join(DIR_OUTPUT, "predict_test_$$.png"),
			get_from_batched(dataset_test, PREDICT_COUNT),
			colormap,
			model=model
		)

logger.info(f"Complete at {str(datetime.now().isoformat())}, elapsed {str((datetime.now() - time_start).total_seconds())} seconds")