OxfordIIITPet in PyTorch

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*My post explains Oxford-IIIT Pet.

OxfordIIITPet() can use Oxford-IIIT Pet 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). *"trainval"(3,680 images) or "test"(3,669 images) can be set to it.
• The 3rd argument is target_types(Optional-Default:"attr"-Type:str or list of str): *Memos:
  • "category", "binary-category" and/or "segmentation" can be set to it: *Memos:
  • "category" is for the label from 37 categories(classes).
  • "binary-category" is for the label of cat(0) or dog(1).
  • "segmentation" is for a segmentation trimap image.
  • An empty tuple or list can also be set to it.
  • The multiple same values can be set to it.
  • If the order of values is different, the order of their elements is also different.
• The 4th argument is transform(Optional-Default:None-Type:callable).
• The 5th argument is target_transform(Optional-Default:None-Type:callable).
• The 6th 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(images.tar.gz and annotations.tar.gz) from here to data/oxford-iiit-pet/.
• About the label from the categories(classes) for the train image indices, Abyssinian(0) is 0~49, American Bulldog(1) is 50~99, American Pit Bull Terrier(2) is 100~149, Basset Hound(3) is 150~199, Beagle(4) is 200~249, Bengal(5) is 250~299, Birman(6) is 300~349, Bombay(7) is 350~398, Boxer(8) is 399~448, British Shorthair(9) is 449~498, etc.
• About the label from the categories(classes) for the test image indices, Abyssinian(0) is 0~97, American Bulldog(1) is 98~197, American Pit Bull Terrier(2) is 198~297, Basset Hound(3) is 298~397, Beagle(4) is 398~497, Bengal(5) is 498~597, Birman(6) is 598~697, Bombay(7) is 698~785, Boxer(8) is 786~884, British Shorthair(9) is 885~984, etc.

from torchvision.datasets import OxfordIIITPet

trainval_cate_data = OxfordIIITPet(
    root="data"
)

trainval_cate_data = OxfordIIITPet(
    root="data",
    split="trainval",
    target_types="category",
    transform=None,
    target_transform=None,
    download=False
)

trainval_bincate_data = OxfordIIITPet(
    root="data",
    split="trainval",
    target_types="binary-category"
)

test_seg_data = OxfordIIITPet(
    root="data",
    split="test",
    target_types="segmentation"
)

test_empty_data = OxfordIIITPet(
    root="data",
    split="test",
    target_types=[]
)

test_all_data = OxfordIIITPet(
    root="data",
    split="test",
    target_types=["category", "binary-category", "segmentation"]
)

len(trainval_cate_data), len(trainval_bincate_data)
# (3680, 3680)

len(test_seg_data), len(test_empty_data), len(test_all_data)
# (3669, 3669, 3669)

trainval_cate_data
# Dataset OxfordIIITPet
#     Number of datapoints: 3680
#     Root location: data

trainval_cate_data.root
# 'data'

trainval_cate_data._split
# 'trainval'

trainval_cate_data._target_types
# ['category']

print(trainval_cate_data.transform)
# None

print(trainval_cate_data.target_transform)
# None

trainval_cate_data._download
# <bound method oxfordiiitpet._download of dataset oxfordiiitpet number datapoints: root location: data>

len(trainval_cate_data.classes), trainval_cate_data.classes
# (37,
#  ['Abyssinian', 'American Bulldog', 'American Pit Bull Terrier',
#   'Basset Hound', 'Beagle', 'Bengal', 'Birman', 'Bombay', 'Boxer',
#   'British Shorthair', ..., 'Wheaten Terrier', 'Yorkshire Terrier'])

trainval_cate_data[0]
# (<pil.image.image image mode="RGB" size="394x500">, 0)

trainval_cate_data[1]
# (<pil.image.image image mode="RGB" size="450x313">, 0)

trainval_cate_data[2]
# (<pil.image.image image mode="RGB" size="500x465">, 0)

trainval_bincate_data[0]
# (<pil.image.image image mode="RGB" size="394x500">, 0)

trainval_bincate_data[1]
# (<pil.image.image image mode="RGB" size="450x313">, 0)

trainval_bincate_data[2]
# (<pil.image.image image mode="RGB" size="500x465">, 0)

test_seg_data[0]
# (<pil.image.image image mode="RGB" size="300x225">,
#  <pil.pngimageplugin.pngimagefile image mode="L" size="300x225">)

test_seg_data[1]
# (<pil.image.image image mode="RGB" size="300x225">,
#  <pil.pngimageplugin.pngimagefile image mode="L" size="300x225">)

test_seg_data[2]
# (<pil.image.image image mode="RGB" size="229x300">,
#  <pil.pngimageplugin.pngimagefile image mode="L" size="229x300">)

test_empty_data[0]
# (<pil.image.image image mode="RGB" size="300x225">, None)

test_empty_data[1]
# (<pil.image.image image mode="RGB" size="300x225">, None)

test_empty_data[2]
# (<pil.image.image image mode="RGB" size="229x300">, None)

test_all_data[0]
# (<pil.image.image image mode="RGB" size="300x225">,
#  (0, 0, <pil.pngimageplugin.pngimagefile image mode="L" size="300x225">))

test_all_data[1]
# (<pil.image.image image mode="RGB" size="300x225">,
#  (0, 0, <pil.pngimageplugin.pngimagefile image mode="L" size="300x225">))

test_all_data[2]
# (<pil.image.image image mode="RGB" size="229x300">,
#  (0, 0, <pil.pngimageplugin.pngimagefile image mode="L" size="229x300">))

import matplotlib.pyplot as plt

def show_images(data, ims, main_title=None):
    if len(data._target_types) == 0:      
        plt.figure(figsize=(12, 6))
        plt.suptitle(t=main_title, y=1.0, fontsize=14)
        for i, j in enumerate(ims, start=1):
            plt.subplot(2, 5, i)
            im, _ = data[j]
            plt.imshow(X=im)
    elif len(data._target_types) == 1:
        if data._target_types[0] == "category":
            plt.figure(figsize=(12, 6))
            plt.suptitle(t=main_title, y=1.0, fontsize=14)
            for i, j in enumerate(ims, start=1):
                plt.subplot(2, 5, i)
                im, cate = data[j]
                plt.title(label=cate)
                plt.imshow(X=im)
        elif data._target_types[0] == "binary-category":
            plt.figure(figsize=(12, 6))
            plt.suptitle(t=main_title, y=1.0, fontsize=14)
            for i, j in enumerate(ims, start=1):
                plt.subplot(2, 5, i)
                im, bincate = data[j]
                plt.title(label=bincate)
                plt.imshow(X=im)
        elif data._target_types[0] == "segmentation":
            plt.figure(figsize=(12, 12))
            plt.suptitle(t=main_title, y=1.0, fontsize=14)
            for i, j in enumerate(ims, start=1):
                im, seg = data[j]
                if 1 



<p><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173486413998858.jpg?x-oss-process=image/resize,p_40" class="lazy" alt="OxfordIIITPet in PyTorch"></p><p><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173486414377932.jpg?x-oss-process=image/resize,p_40" class="lazy" alt="OxfordIIITPet in PyTorch"></p>

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<p><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173486415046391.jpg?x-oss-process=image/resize,p_40" class="lazy" alt="OxfordIIITPet in PyTorch"></p>

<p><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173486415371337.jpg?x-oss-process=image/resize,p_40" class="lazy" alt="OxfordIIITPet in PyTorch"></p>


          

            
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