114 lines
3.7 KiB
Python
114 lines
3.7 KiB
Python
import json
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import os
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import shutil
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import numpy as np
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from generate_adj_mx import generate_adj_pems03 as generate_adj
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# Hyperparameters
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dataset_name = 'PEMS03'
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data_file_path = f'datasets/raw_data/{dataset_name}/{dataset_name}.npz'
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graph_file_path = f'datasets/raw_data/{dataset_name}/adj_{dataset_name}.pkl'
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output_dir = f'datasets/{dataset_name}'
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target_channel = [0] # Target traffic flow channel
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add_time_of_day = True # Add time of day as a feature
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add_day_of_week = True # Add day of the week as a feature
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steps_per_day = 288 # Number of time steps per day
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frequency = 1440 // steps_per_day
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domain = 'traffic flow'
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feature_description = [domain, 'time of day', 'day of week']
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regular_settings = {
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'INPUT_LEN': 12,
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'OUTPUT_LEN': 12,
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'TRAIN_VAL_TEST_RATIO': [0.6, 0.2, 0.2],
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'NORM_EACH_CHANNEL': False,
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'RESCALE': True,
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'METRICS': ['MAE', 'RMSE', 'MAPE'],
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'NULL_VAL': 0.0
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}
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def load_and_preprocess_data():
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'''Load and preprocess raw data, selecting the specified channel(s).'''
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data = np.load(data_file_path)['data']
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data = data[..., target_channel]
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print(f'Raw time series shape: {data.shape}')
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return data
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def add_temporal_features(data):
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'''Add time of day and day of week as features to the data.'''
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l, n, _ = data.shape
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feature_list = [data]
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if add_time_of_day:
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time_of_day = np.array([i % steps_per_day / steps_per_day for i in range(l)])
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time_of_day_tiled = np.tile(time_of_day, [1, n, 1]).transpose((2, 1, 0))
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feature_list.append(time_of_day_tiled)
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if add_day_of_week:
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day_of_week = np.array([(i // steps_per_day) % 7 / 7 for i in range(l)])
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day_of_week_tiled = np.tile(day_of_week, [1, n, 1]).transpose((2, 1, 0))
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feature_list.append(day_of_week_tiled)
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data_with_features = np.concatenate(feature_list, axis=-1) # L x N x C
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return data_with_features
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def save_data(data):
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'''Save the preprocessed data to a binary file.'''
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if not os.path.exists(output_dir):
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os.makedirs(output_dir)
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file_path = os.path.join(output_dir, 'data.dat')
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fp = np.memmap(file_path, dtype='float32', mode='w+', shape=data.shape)
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fp[:] = data[:]
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fp.flush()
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del fp
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print(f'Data saved to {file_path}')
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def save_graph():
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'''Save the adjacency matrix to the output directory, generating it if necessary.'''
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output_graph_path = os.path.join(output_dir, 'adj_mx.pkl')
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if os.path.exists(graph_file_path):
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shutil.copyfile(graph_file_path, output_graph_path)
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else:
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generate_adj()
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shutil.copyfile(graph_file_path, output_graph_path)
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print(f'Adjacency matrix saved to {output_graph_path}')
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def save_description(data):
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'''Save a description of the dataset to a JSON file.'''
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description = {
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'name': dataset_name,
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'domain': domain,
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'shape': data.shape,
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'num_time_steps': data.shape[0],
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'num_nodes': data.shape[1],
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'num_features': data.shape[2],
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'feature_description': feature_description,
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'has_graph': graph_file_path is not None,
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'frequency (minutes)': frequency,
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'regular_settings': regular_settings
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}
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description_path = os.path.join(output_dir, 'desc.json')
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with open(description_path, 'w') as f:
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json.dump(description, f, indent=4)
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print(f'Description saved to {description_path}')
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print(description)
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def main():
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# Load and preprocess data
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data = load_and_preprocess_data()
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# Add temporal features
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data_with_features = add_temporal_features(data)
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# Save processed data
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save_data(data_with_features)
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# Copy or generate and save adjacency matrix
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save_graph()
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# Save dataset description
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save_description(data_with_features)
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if __name__ == '__main__':
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main()
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