research-rainfallradar/aimodel/src/lib/dataset/dataset_segmenter.py

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import os
import math
import json
from loguru import logger
import tensorflow as tf
from lib.dataset.read_metadata import read_metadata
from ..io.readfile import readfile
from .shuffle import shuffle
# TO PARSE:
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def parse_item(metadata, shape_water_desired, water_threshold=0.1):
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water_width_source, water_height_source, _water_channels_source = metadata["waterdepth"]
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water_width_target, water_height_target = shape_water_desired
water_offset_x = math.ceil((water_width_source - water_width_target) / 2)
water_offset_y = math.ceil((water_height_source - water_height_target) / 2)
def parse_item_inner(item):
parsed = tf.io.parse_single_example(item, features={
"rainfallradar": tf.io.FixedLenFeature([], tf.string),
"waterdepth": tf.io.FixedLenFeature([], tf.string)
})
rainfall = tf.io.parse_tensor(parsed["rainfallradar"], out_type=tf.float32)
water = tf.io.parse_tensor(parsed["waterdepth"], out_type=tf.float32)
rainfall = tf.reshape(rainfall, tf.constant(metadata["rainfallradar"], dtype=tf.int32))
water = tf.reshape(water, tf.constant(metadata["waterdepth"], dtype=tf.int32))
# SHAPES:
# rainfall = [ feature_dim ]
# water = [ width, height, 1 ]
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water = tf.cast(tf.math.greater_equal(water, water_threshold), dtype=tf.int32)
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water = tf.image.crop_to_bounding_box(water, water_offset_x, water_offset_y, water_width_target, water_height_target)
print("DEBUG:dataset ITEM rainfall:shape", rainfall.shape, "water:shape", water.shape)
# TODO: Add any other additional parsing here, since multiple .map() calls are not optimal
return rainfall, water
return tf.function(parse_item_inner)
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def make_dataset(filepaths, metadata, shape_water_desired=[100,100], water_threshold=0.1, compression_type="GZIP", parallel_reads_multiplier=1.5, shuffle_buffer_size=128, batch_size=64, prefetch=True, shuffle=True):
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if "NO_PREFETCH" in os.environ:
logger.info("disabling data prefetching.")
dataset = tf.data.TFRecordDataset(filepaths,
compression_type=compression_type,
num_parallel_reads=math.ceil(os.cpu_count() * parallel_reads_multiplier) if parallel_reads_multiplier > 0 else None
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)
if shuffle:
dataset = dataset.shuffle(shuffle_buffer_size)
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dataset = dataset.map(parse_item(metadata, shape_water_desired=shape_water_desired, water_threshold=water_threshold), num_parallel_calls=tf.data.AUTOTUNE)
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if batch_size != None:
dataset = dataset.batch(batch_size, drop_remainder=True)
if prefetch:
dataset = dataset.prefetch(0 if "NO_PREFETCH" in os.environ else tf.data.AUTOTUNE)
return dataset
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def get_filepaths(dirpath_input, do_shuffle=True):
result = list(filter(
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lambda filepath: str(filepath).endswith(".tfrecord.gz"),
[ file.path for file in os.scandir(dirpath_input) ] # .path on a DirEntry object yields the absolute filepath
))
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if do_shuffle:
result = shuffle(result)
else:
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result = sorted(result, key=lambda filepath: int(os.path.basename(filepath).split(".", 1)[0]))
return result
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def dataset_segmenter(dirpath_input, batch_size=64, train_percentage=0.8, parallel_reads_multiplier=1.5, water_threshold=0.1, shape_water_desired=[100,100]):
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filepaths = get_filepaths(dirpath_input)
filepaths_count = len(filepaths)
dataset_splitpoint = math.floor(filepaths_count * train_percentage)
filepaths_train = filepaths[:dataset_splitpoint]
filepaths_validate = filepaths[dataset_splitpoint:]
metadata = read_metadata(dirpath_input)
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dataset_train = make_dataset(filepaths_train, metadata, batch_size=batch_size, parallel_reads_multiplier=parallel_reads_multiplier, water_threshold=water_threshold, shape_water_desired=shape_water_desired)
dataset_validate = make_dataset(filepaths_validate, metadata, batch_size=batch_size, parallel_reads_multiplier=parallel_reads_multiplier, water_threshold=water_threshold, shape_water_desired=shape_water_desired)
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return dataset_train, dataset_validate #, filepaths
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def dataset_predict(dirpath_input, parallel_reads_multiplier=1.5, prefetch=True, water_threshold=0.1):
"""Creates a tf.data.Dataset() for prediction using the image segmentation head model.
Note that this WILL MANGLE THE ORDERING if you set parallel_reads_multiplier to anything other than 0!!
Args:
dirpath_input (string): The path to the directory containing the input (.tfrecord.gz) files
parallel_reads_multiplier (float, optional): The number of files to read in parallel. Defaults to 1.5.
prefetch (bool, optional): Whether to prefetch data into memory or not. Defaults to True.
water_threshold (float, optional): The water depth threshold to consider cells to contain water, in metres. Defaults to 0.1.
Returns:
tf.data.Dataset: A tensorflow Dataset for the given input files.
"""
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filepaths = get_filepaths(dirpath_input, do_shuffle=False) if os.path.isdir(dirpath_input) else [ dirpath_input ]
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return make_dataset(
filepaths=filepaths,
metadata=read_metadata(dirpath_input),
parallel_reads_multiplier=parallel_reads_multiplier,
batch_size=None,
prefetch=prefetch,
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shuffle=False, #even with shuffle=False we're not gonna get them all in the same order since we're reading in parallel
water_threshold=water_threshold
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)
if __name__ == "__main__":
ds_train, ds_validate = dataset_segmenter("/mnt/research-data/main/PhD-Rainfall-Radar/aimodel/output/rainfallwater_records_embed_d512e19_tfrecord/")
for thing in ds_validate():
as_str = str(thing)
print(thing[:200])