python - How to load a list of numpy arrays to pytorch dataset loader?

Question

I have a huge list of numpy arrays, where each array represents an image and I want to load it using torch.utils.data.Dataloader object. But the documentation of torch.utils.data.Dataloader mentions that it loads data directly from a folder. How do I modify it for my cause? I am new to pytorch and any help would be greatly appreciated. my numpy array for a single image looks something like this. The image is RBG image.

[[[ 70  82  94]
  [ 67  81  93]
  [ 66  82  94]
  ..., 
  [182 182 188]
  [183 183 189]
  [188 186 192]]

 [[ 66  80  92]
  [ 62  78  91]
  [ 64  79  95]
  ..., 
  [176 176 182]
  [178 178 184]
  [180 180 186]]

 [[ 62  82  93]
  [ 62  81  96]
  [ 65  80  99]
  ..., 
  [169 172 177]
  [173 173 179]
  [172 172 178]]

 ..., 

Answer 1

I think what DataLoader actually requires is an input that subclasses Dataset. You can either write your own dataset class that subclasses Datasetor use TensorDataset as I have done below:

import torch
import numpy as np
from torch.utils.data import TensorDataset, DataLoader

my_x = [np.array([[1.0,2],[3,4]]),np.array([[5.,6],[7,8]])] # a list of numpy arrays
my_y = [np.array([4.]), np.array([2.])] # another list of numpy arrays (targets)

tensor_x = torch.Tensor(my_x) # transform to torch tensor
tensor_y = torch.Tensor(my_y)

my_dataset = TensorDataset(tensor_x,tensor_y) # create your datset
my_dataloader = DataLoader(my_dataset) # create your dataloader

Works for me. Hope it helps you.