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dataset_pm25.py
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dataset_pm25.py
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import pickle
from torch.utils.data import DataLoader, Dataset
import pandas as pd
import numpy as np
import torch
class PM25_Dataset(Dataset):
def __init__(self, eval_length=36, target_dim=36, mode="train", validindex=0):
self.eval_length = eval_length
self.target_dim = target_dim
path = "./data/pm25/pm25_meanstd.pk"
with open(path, "rb") as f:
self.train_mean, self.train_std = pickle.load(f)
if mode == "train":
month_list = [1, 2, 4, 5, 7, 8, 10, 11]
# 1st,4th,7th,10th months are excluded from histmask (since the months are used for creating missing patterns in test dataset)
flag_for_histmask = [0, 1, 0, 1, 0, 1, 0, 1]
month_list.pop(validindex)
flag_for_histmask.pop(validindex)
elif mode == "valid":
month_list = [1, 2, 4, 5, 7, 8, 10, 11]
month_list = month_list[validindex : validindex + 1]
elif mode == "test":
month_list = [3, 6, 9, 12]
self.month_list = month_list
# create data for batch
self.observed_data = [] # values (separated into each month)
self.observed_mask = [] # masks (separated into each month)
self.gt_mask = [] # ground-truth masks (separated into each month)
self.index_month = [] # indicate month
self.position_in_month = [] # indicate the start position in month (length is the same as index_month)
self.valid_for_histmask = [] # whether the sample is used for histmask
self.use_index = [] # to separate train/valid/test
self.cut_length = [] # excluded from evaluation targets
df = pd.read_csv(
"./data/pm25/Code/STMVL/SampleData/pm25_ground.txt",
index_col="datetime",
parse_dates=True,
)
df_gt = pd.read_csv(
"./data/pm25/Code/STMVL/SampleData/pm25_missing.txt",
index_col="datetime",
parse_dates=True,
)
for i in range(len(month_list)):
current_df = df[df.index.month == month_list[i]]
current_df_gt = df_gt[df_gt.index.month == month_list[i]]
current_length = len(current_df) - eval_length + 1
last_index = len(self.index_month)
self.index_month += np.array([i] * current_length).tolist()
self.position_in_month += np.arange(current_length).tolist()
if mode == "train":
self.valid_for_histmask += np.array(
[flag_for_histmask[i]] * current_length
).tolist()
# mask values for observed indices are 1
c_mask = 1 - current_df.isnull().values
c_gt_mask = 1 - current_df_gt.isnull().values
c_data = (
(current_df.fillna(0).values - self.train_mean) / self.train_std
) * c_mask
self.observed_mask.append(c_mask)
self.gt_mask.append(c_gt_mask)
self.observed_data.append(c_data)
if mode == "test":
n_sample = len(current_df) // eval_length
# interval size is eval_length (missing values are imputed only once)
c_index = np.arange(
last_index, last_index + eval_length * n_sample, eval_length
)
self.use_index += c_index.tolist()
self.cut_length += [0] * len(c_index)
if len(current_df) % eval_length != 0: # avoid double-count for the last time-series
self.use_index += [len(self.index_month) - 1]
self.cut_length += [eval_length - len(current_df) % eval_length]
if mode != "test":
self.use_index = np.arange(len(self.index_month))
self.cut_length = [0] * len(self.use_index)
# masks for 1st,4th,7th,10th months are used for creating missing patterns in test data,
# so these months are excluded from histmask to avoid leakage
if mode == "train":
ind = -1
self.index_month_histmask = []
self.position_in_month_histmask = []
for i in range(len(self.index_month)):
while True:
ind += 1
if ind == len(self.index_month):
ind = 0
if self.valid_for_histmask[ind] == 1:
self.index_month_histmask.append(self.index_month[ind])
self.position_in_month_histmask.append(
self.position_in_month[ind]
)
break
else: # dummy (histmask is only used for training)
self.index_month_histmask = self.index_month
self.position_in_month_histmask = self.position_in_month
def __getitem__(self, org_index):
index = self.use_index[org_index]
c_month = self.index_month[index]
c_index = self.position_in_month[index]
hist_month = self.index_month_histmask[index]
hist_index = self.position_in_month_histmask[index]
s = {
"observed_data": self.observed_data[c_month][
c_index : c_index + self.eval_length
],
"observed_mask": self.observed_mask[c_month][
c_index : c_index + self.eval_length
],
"gt_mask": self.gt_mask[c_month][
c_index : c_index + self.eval_length
],
"hist_mask": self.observed_mask[hist_month][
hist_index : hist_index + self.eval_length
],
"timepoints": np.arange(self.eval_length),
"cut_length": self.cut_length[org_index],
}
return s
def __len__(self):
return len(self.use_index)
def get_dataloader(batch_size, device, validindex=0):
dataset = PM25_Dataset(mode="train", validindex=validindex)
train_loader = DataLoader(
dataset, batch_size=batch_size, num_workers=1, shuffle=True
)
dataset_test = PM25_Dataset(mode="test", validindex=validindex)
test_loader = DataLoader(
dataset_test, batch_size=batch_size, num_workers=1, shuffle=False
)
dataset_valid = PM25_Dataset(mode="valid", validindex=validindex)
valid_loader = DataLoader(
dataset_valid, batch_size=batch_size, num_workers=1, shuffle=False
)
scaler = torch.from_numpy(dataset.train_std).to(device).float()
mean_scaler = torch.from_numpy(dataset.train_mean).to(device).float()
return train_loader, valid_loader, test_loader, scaler, mean_scaler