Add EMNIST data loader

[sourcery-ai[bot]]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 0.67%.

Quality metrics	Before	After	Change
Complexity	0.52 ⭐	0.45 ⭐	-0.07 👍
Method Length	72.23 🙂	71.47 🙂	-0.76 👍
Working memory	11.27 😞	11.14 😞	-0.13 👍
Quality	69.79% 🙂	70.46% 🙂	0.67% 👍

Other metrics	Before	After	Change
Lines	314	359	45

Changed files	Quality Before	Quality After	Quality Change
datasets/dataset_loading_hub.py	69.79% 🙂	70.46% 🙂	0.67% 👍

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
datasets/dataset_loading_hub.py	load_dataset	0 ⭐	116 🙂	21 ⛔	54.03% 🙂	Extract out complex expressions
datasets/dataset_loading_hub.py	CINIC10Loader.get_data	4 ⭐	92 🙂	11 😞	64.24% 🙂	Extract out complex expressions
datasets/dataset_loading_hub.py	CIFAR10Loader.get_data	0 ⭐	84 🙂	12 😞	67.64% 🙂	Extract out complex expressions
datasets/dataset_loading_hub.py	CIFAR100Loader.get_data	0 ⭐	84 🙂	12 😞	67.64% 🙂	Extract out complex expressions
datasets/dataset_loading_hub.py	ImageNetLoader.get_data	0 ⭐	87 🙂	11 😞	68.94% 🙂	Extract out complex expressions

Legend and Explanation

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• ⭐ excellent
• 🙂 good
• 😞 poor
• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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