翻译一下 shuffle_data = merge_data.sample(frac=1.0) shuffle_data = shuffle_data.reset_index(drop=True)

Sure, I can translate that for you. "shuffle_data = merge_data.sample(frac=1.0)" means that the code randomly samples (or shuffles) the data in "merge_data" with a fraction of 1.0, which means all the data will be included in the shuffle. "shuffle_data = shuffle_data.reset_index(drop=True)" means that the code resets the index of the shuffled data to a new sequence, starting from 0 and dropping the old index. Is there anything else you would like to ask?

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class DistributedSampler(_DistributedSampler): def __init__(self, dataset, num_replicas=None, rank=None, shuffle=True): super().__init__(dataset, num_replicas=num_replicas, rank=rank) self.shuffle = shuffle def __iter__(self): if self.shuffle: g = torch.Generator() g.manual_seed(self.epoch) indices = torch.randperm(len(self.dataset), generator=g).tolist() else: indices = torch.arange(len(self.dataset)).tolist() indices += indices[:(self.total_size - len(indices))] assert len(indices) == self.total_size indices = indices[self.rank:self.total_size:self.num_replicas] assert len(indices) == self.num_samples return iter(indices) def build_dataloader(dataset_cfg, class_names, batch_size, dist, root_path=None, workers=4, seed=None, logger=None, training=True, merge_all_iters_to_one_epoch=False, total_epochs=0): dataset = __all__[dataset_cfg.DATASET]( dataset_cfg=dataset_cfg, class_names=class_names, root_path=root_path, training=training, logger=logger, ) if merge_all_iters_to_one_epoch: assert hasattr(dataset, 'merge_all_iters_to_one_epoch') dataset.merge_all_iters_to_one_epoch(merge=True, epochs=total_epochs) if dist: if training: sampler = torch.utils.data.distributed.DistributedSampler(dataset) else: rank, world_size = common_utils.get_dist_info() sampler = DistributedSampler(dataset, world_size, rank, shuffle=False) else: sampler = None dataloader = DataLoader( dataset, batch_size=batch_size, pin_memory=True, num_workers=workers, shuffle=(sampler is None) and training, collate_fn=dataset.collate_batch, drop_last=False, sampler=sampler, timeout=0, worker_init_fn=partial(common_utils.worker_init_fn, seed=seed) ) return dataset, dataloader, sampler

这段代码是一个用于构建数据加载器的函数。它接受一些参数，包括数据集的配置、类别名称、批次大小、分布式训练标志、数据集的根路径等。

首先，根据数据集的配置和其他参数，创建一个数据集对象。

如果设置了 `merge_all_iters_to_one_epoch` 标志为 `True`，则调用数据集对象的 `merge_all_iters_to_one_epoch` 方法，将所有迭代器合并到一个周期中。

接下来，如果分布式训练标志为 `True`，则根据训练模式创建相应的采样器。对于训练模式，使用 `torch.utils.data.distributed.DistributedSampler` 创建采样器；对于非训练模式，根据当前进程的排名和世界大小创建 `DistributedSampler` 采样器，并设置 `shuffle` 参数为 `False`。

如果不是分布式训练，则采样器为 `None`。

最后，使用 `torch.utils.data.DataLoader` 创建数据加载器，传入数据集对象、批次大小、是否在训练模式下洗牌、数据集对象的 `collate_batch` 方法用于批量整理数据、是否丢弃最后一个批次、采样器以及其他参数。

函数返回数据集对象、数据加载器和采样器。

function median_target(var) { temp = data[data[var].notnull()]; temp = temp[[var, 'Outcome']].groupby(['Outcome'])[[var]].median().reset_index(); return temp; } data.loc[(data['Outcome'] == 0) & (data['Insulin'].isnull()), 'Insulin'] = 102.5; data.loc[(data['Outcome'] == 1) & (data['Insulin'].isnull()), 'Insulin'] = 169.5; data.loc[(data['Outcome'] == 0) & (data['Glucose'].isnull()), 'Glucose'] = 107; data.loc[(data['Outcome'] == 1) & (data['Glucose'].isnull()), 'Glucose'] = 1; data.loc[(data['Outcome'] == 0) & (data['SkinThickness'].isnull()), 'SkinThickness'] = 27; data.loc[(data['Outcome'] == 1) & (data['SkinThickness'].isnull()), 'SkinThickness'] = 32; data.loc[(data['Outcome'] == 0) & (data['BloodPressure'].isnull()), 'BloodPressure'] = 70; data.loc[(data['Outcome'] == 1) & (data['BloodPressure'].isnull()), 'BloodPressure'] = 74.5; data.loc[(data['Outcome'] == 0) & (data['BMI'].isnull()), 'BMI'] = 30.1; data.loc[(data['Outcome'] == 1) & (data['BMI'].isnull()), 'BMI'] = 34.3; target_col = ["Outcome"]; cat_cols = data.nunique()[data.nunique() < 12].keys().tolist(); cat_cols = [x for x in cat_cols]; num_cols = [x for x in data.columns if x not in cat_cols + target_col]; bin_cols = data.nunique()[data.nunique() == 2].keys().tolist(); multi_cols = [i for i in cat_cols if i in bin_cols]; le = LabelEncoder(); for i in bin_cols: data[i] = le.fit_transform(data[i]); data = pd.get_dummies(data=data, columns=multi_cols); std = StandardScaler(); scaled = std.fit_transform(data[num_cols]); scaled = pd.DataFrame(scaled, columns=num_cols); df_data_og = data.copy(); data = data.drop(columns=num_cols, axis=1); data = data.merge(scaled, left_index=True, right_index=True, how='left'); X = data.drop('Outcome', axis=1); y = data['Outcome']; X_train, X_test, y_train, y_test = train_test_split(X, y, train_size=0.8, shuffle=True, random_state=1); y_train = to_categorical(y_train); y_test = to_categorical(y_test);将这段代码添加注释

# 导入必要的库
import pandas as pd
from sklearn.preprocessing import LabelEncoder, StandardScaler
from keras.utils import to_categorical
from sklearn.model_selection import train_test_split

# 定义函数，返回每个特征在不同结果下的中位数
def median_target(var):
temp = data[data[var].notnull()]
temp = temp[[var, 'Outcome']].groupby(['Outcome'])[[var]].median().reset_index()
return temp

# 将缺失值填充为中位数
data.loc[(data['Outcome'] == 0) & (data['Insulin'].isnull()), 'Insulin'] = 102.5
data.loc[(data['Outcome'] == 1) & (data['Insulin'].isnull()), 'Insulin'] = 169.5
data.loc[(data['Outcome'] == 0) & (data['Glucose'].isnull()), 'Glucose'] = 107
data.loc[(data['Outcome'] == 1) & (data['Glucose'].isnull()), 'Glucose'] = 1
data.loc[(data['Outcome'] == 0) & (data['SkinThickness'].isnull()), 'SkinThickness'] = 27
data.loc[(data['Outcome'] == 1) & (data['SkinThickness'].isnull()), 'SkinThickness'] = 32
data.loc[(data['Outcome'] == 0) & (data['BloodPressure'].isnull()), 'BloodPressure'] = 70
data.loc[(data['Outcome'] == 1) & (data['BloodPressure'].isnull()), 'BloodPressure'] = 74.5
data.loc[(data['Outcome'] == 0) & (data['BMI'].isnull()), 'BMI'] = 30.1
data.loc[(data['Outcome'] == 1) & (data['BMI'].isnull()), 'BMI'] = 34.3

# 将数据进行分类处理
target_col = ["Outcome"]
cat_cols = data.nunique()[data.nunique() < 12].keys().tolist()
cat_cols = [x for x in cat_cols]
num_cols = [x for x in data.columns if x not in cat_cols + target_col]
bin_cols = data.nunique()[data.nunique() == 2].keys().tolist()
multi_cols = [i for i in cat_cols if i in bin_cols]

# 对二分类特征进行编码
le = LabelEncoder()
for i in bin_cols:
data[i] = le.fit_transform(data[i])

# 将分类特征进行独热编码
data = pd.get_dummies(data=data, columns=multi_cols)

# 对数值特征进行标准化
std = StandardScaler()
scaled = std.fit_transform(data[num_cols])
scaled = pd.DataFrame(scaled, columns=num_cols)

# 将数据进行合并
df_data_og = data.copy()
data = data.drop(columns=num_cols, axis=1)
data = data.merge(scaled, left_index=True, right_index=True, how='left')

# 划分训练集和测试集，对标签进行独热编码
X = data.drop('Outcome', axis=1)
y = data['Outcome']
X_train, X_test, y_train, y_test = train_test_split(X, y, train_size=0.8, shuffle=True, random_state=1)
y_train = to_categorical(y_train)
y_test = to_categorical(y_test)