Flowers in PyTorch

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*My post explains Oxford 102 Flower.

Flowers102() can use Oxford 102 Flower dataset as shown below:

*Memos:

• The 1st argument is root(Required-Type:str or pathlib.Path). *An absolute or relative path is possible.
• The 2nd argument is split(Optional-Default:"train"-Type:str). *"train"(1,020 images), "val"(1,020 images) or "test"(6,149 images) can be set to it.
• The 3rd argument is transform(Optional-Default:None-Type:callable).
• The 4th argument is target_transform(Optional-Default:None-Type:callable).
• The 5th argument is download(Optional-Default:False-Type:bool): *Memos:
  • If it's True, the dataset is downloaded from the internet and extracted(unzipped) to root.
  • If it's True and the dataset is already downloaded, it's extracted.
  • If it's True and the dataset is already downloaded and extracted, nothing happens.
  • It should be False if the dataset is already downloaded and extracted because it's faster.
  • You can manually download and extract the dataset(102flowers.tgz with imagelabels.mat and setid.matff from here to data/flowers-102/.
• About the label from the categories(classes) for the train and validation image indices, 0 is 0~9, 1 is 10~19, 2 is 20~29, 3 is 30~39, 4 is 40~49, 5 is 50~59, 6 is 60~69, 7 is 70~79, 8 is 80~89, 9 is 90~99, etc.
• About the label from the categories(classes) for the test image indices, 0 is 0~19, 1 is 20~59, 2 is 60~79, 3 is 80~115, 4 is 116~160, 5 is 161~185, 6 is 186~205, 7 is 206~270, 8 is 271~296, 9 is 297~321, etc.

from torchvision.datasets import Flowers102

train_data = Flowers102(
    root="data"
)

train_data = Flowers102(
    root="data",
    split="train",
    transform=None,
    target_transform=None,
    download=False
)

val_data = Flowers102(
    root="data",
    split="val"
)

test_data = Flowers102(
    root="data",
    split="test"
)

len(train_data), len(val_data), len(test_data)
# (1020, 1020, 6149)

train_data
# Dataset Flowers102
#     Number of datapoints: 1020
#     Root location: data
#     split=train

train_data.root
# 'data'

train_data._split
# 'train'

print(train_data.transform)
# None

print(train_data.target_transform)
# None

train_data.download
# <bound method Flowers102.download of Dataset Flowers102
#     Number of datapoints: 1020
#     Root location: data
#     split=train>

len(set(train_data._labels)), train_data._labels
# (102,
#  [0, 0, 0, ..., 1, ..., 2, ..., 3, ..., 4, ..., 5, ..., 6, ..., 101])

train_data[0]
# (<PIL.Image.Image image mode=RGB size=754x500>, 0)

train_data[1]
# (<PIL.Image.Image image mode=RGB size=624x500>, 0)

train_data[2]
# (<PIL.Image.Image image mode=RGB size=667x500>, 0)

train_data[10]
# (<PIL.Image.Image image mode=RGB size=500x682>, 1)

train_data[20]
# (<PIL.Image.Image image mode=RGB size=667x500>, 2)

val_data[0]
# (<PIL.Image.Image image mode=RGB size=606x500>, 0)

val_data[1]
# (<PIL.Image.Image image mode=RGB size=667x500>, 0)

val_data[2]
# (<PIL.Image.Image image mode=RGB size=500x628>, 0)

val_data[10]
# (<PIL.Image.Image image mode=RGB size=500x766>, 1)

val_data[20]
# (<PIL.Image.Image image mode=RGB size=624x500>, 2)

test_data[0]
# (<PIL.Image.Image image mode=RGB size=523x500>, 0)

test_data[1]
# (<PIL.Image.Image image mode=RGB size=666x500>, 0)

test_data[2]
# (<PIL.Image.Image image mode=RGB size=595x500>, 0)

test_data[20]
# (<PIL.Image.Image image mode=RGB size=500x578>, 1)

test_data[60]
# (<PIL.Image.Image image mode=RGB size=500x625>, 2)

import matplotlib.pyplot as plt

def show_images(data, ims, main_title=None):
    plt.figure(figsize=(10, 5))
    plt.suptitle(t=main_title, y=1.0, fontsize=14)
    for i, j in enumerate(ims, start=1):
        plt.subplot(2, 5, i)
        im, lab = data[j]
        plt.imshow(X=im)
        plt.title(label=lab)
    plt.tight_layout()
    plt.show()

train_ims = (0, 1, 2, 10, 20, 30, 40, 50, 60, 70)
val_ims = (0, 1, 2, 10, 20, 30, 40, 50, 60, 70)
test_ims = (0, 1, 2, 20, 60, 80, 116, 161, 186, 206)

show_images(data=train_data, ims=train_ims, main_title="train_data")
show_images(data=train_data, ims=val_ims, main_title="val_data")
show_images(data=test_data, ims=test_ims, main_title="test_data")

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