mirror of
https://github.com/sbrl/research-rainfallradar
synced 2024-11-17 15:12:59 +00:00
107 lines
No EOL
4.3 KiB
Python
107 lines
No EOL
4.3 KiB
Python
import os
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import math
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import json
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from loguru import logger
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import tensorflow as tf
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from lib.dataset.read_metadata import read_metadata
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from ..io.readfile import readfile
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from .shuffle import shuffle
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# 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 = metadata["waterdepth"]
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water_width_target, water_height_target = shape_water_desired
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water_offset_x = math.ceil((water_width_source - water_width_target) / 2)
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water_offset_y = math.ceil((water_height_source - water_height_target) / 2)
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def parse_item_inner(item):
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parsed = tf.io.parse_single_example(item, features={
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"rainfallradar": tf.io.FixedLenFeature([], tf.string),
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"waterdepth": tf.io.FixedLenFeature([], tf.string)
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})
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rainfall = tf.io.parse_tensor(parsed["rainfallradar"], out_type=tf.float32)
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water = tf.io.parse_tensor(parsed["waterdepth"], out_type=tf.float32)
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rainfall = tf.reshape(rainfall, tf.constant(metadata["rainfallradar"], dtype=tf.int32))
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water = tf.reshape(water, tf.constant(metadata["waterdepth"], dtype=tf.int32))
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# SHAPES:
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# rainfall = [ feature_dim ]
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# 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)
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print("DEBUG:dataset ITEM rainfall:shape", rainfall.shape, "water:shape", water.shape)
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# TODO: Add any other additional parsing here, since multiple .map() calls are not optimal
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return rainfall, water
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return tf.function(parse_item_inner)
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def make_dataset(filepaths, metadata, shape_watch_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:
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logger.info("disabling data prefetching.")
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dataset = tf.data.TFRecordDataset(filepaths,
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compression_type=compression_type,
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num_parallel_reads=math.ceil(os.cpu_count() * parallel_reads_multiplier)
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)
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if shuffle:
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dataset = dataset.shuffle(shuffle_buffer_size)
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dataset = dataset.map(parse_item(metadata, shape_water_desired=shape_watch_desired, water_threshold=water_threshold), num_parallel_calls=tf.data.AUTOTUNE)
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if batch_size != None:
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dataset = dataset.batch(batch_size, drop_remainder=True)
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if prefetch:
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dataset = dataset.prefetch(0 if "NO_PREFETCH" in os.environ else tf.data.AUTOTUNE)
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return dataset
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def get_filepaths(dirpath_input):
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return shuffle(list(filter(
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lambda filepath: str(filepath).endswith(".tfrecord.gz"),
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[ file.path for file in os.scandir(dirpath_input) ] # .path on a DirEntry object yields the absolute filepath
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)))
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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):
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filepaths = get_filepaths(dirpath_input)
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filepaths_count = len(filepaths)
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dataset_splitpoint = math.floor(filepaths_count * train_percentage)
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filepaths_train = filepaths[:dataset_splitpoint]
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filepaths_validate = filepaths[dataset_splitpoint:]
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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)
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dataset_validate = make_dataset(filepaths_validate, metadata, batch_size=batch_size, parallel_reads_multiplier=parallel_reads_multiplier, water_threshold=water_threshold)
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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):
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filepaths = get_filepaths(dirpath_input) if os.path.isdir(dirpath_input) else [ dirpath_input ]
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return make_dataset(
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filepaths=filepaths,
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metadata=read_metadata(dirpath_input),
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parallel_reads_multiplier=parallel_reads_multiplier,
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batch_size=None,
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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
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water_threshold=water_threshold
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)
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if __name__ == "__main__":
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ds_train, ds_validate = dataset_segmenter("/mnt/research-data/main/PhD-Rainfall-Radar/aimodel/output/rainfallwater_records_embed_d512e19_tfrecord/")
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for thing in ds_validate():
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as_str = str(thing)
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print(thing[:200]) |