如何在 PyTorch Lightning 中从 prepare_data() 获取数据集到 setup()

如何解决如何在 PyTorch Lightning 中从 prepare_data() 获取数据集到 setup()

我使用 PyTorch Lightning 的 NumPy 方法在 prepare_data() 方法中使用 DataModules 创建了自己的数据集。现在，我想将数据传递给 setup() 方法以拆分为训练和验证。

import numpy as np 
import pytorch_lightning as pl 
from torch.utils.data import random_split,DataLoader,TensorDataset
import torch
from torch.autograd import Variable
from torchvision import transforms

np.random.seed(42)

device = 'cuda' if torch.cuda.is_available() else 'cpu'

class DataModuleClass(pl.LightningDataModule):
    def __init__(self):
        super().__init__()
        self.constant = 2
        self.batch_size = 10
        
    def prepare_data(self):
        a = np.random.uniform(0,500,500)
        b = np.random.normal(0,self.constant,len(a))

        c = a + b
        X = np.transpose(np.array([a,b]))
        
        # Converting numpy array to Tensor
        self.x_train_tensor = torch.from_numpy(X).float().to(device)
        self.y_train_tensor = torch.from_numpy(c).float().to(device)
        
        training_dataset = TensorDataset(self.x_train_tensor,self.y_train_tensor)

        return training_dataset
    
    def setup(self):
        data = # What I have to write to get the data from prepare_data()
        self.train_data,self.val_data = random_split(data,[400,100])
        
        
    def train_dataloader(self):
        training_dataloader = setup() # Need to get the training data
        return DataLoader(self.training_dataloader)

    def val_dataloader(self):
        validation_dataloader = prepare_data() # Need to get the validation data
        return DataLoader(self.validation_dataloader)
    
obj = DataModuleClass()
print(obj.prepare_data())  

解决方法

与您之前的问题相同的答案...

def prepare_data(self):
    a = np.random.uniform(0,500,500)
    b = np.random.normal(0,self.constant,len(a))

    c = a + b
    X = np.transpose(np.array([a,b]))

    # Converting numpy array to Tensor
    self.x_train_tensor = torch.from_numpy(X).float().to(device)
    self.y_train_tensor = torch.from_numpy(c).float().to(device)

    training_dataset = TensorDataset(self.x_train_tensor,self.y_train_tensor)

    self.training_dataset = training_dataset

def setup(self):
    data = self.training_dataset
    self.train_data,self.val_data = random_split(data,[400,100])
    
    
def train_dataloader(self):
    return DataLoader(self.train_data)

def val_dataloader(self):
    return DataLoader(self.val_data)