Created mnist_classifier.py - Classifying MNIST dataset using a modified AlexNet

[blackeye735]

Python program to train and test a MNIST dataset using a modified AlexNet model.

The program should accept three integers as command line input. First two integers define the labels of the two-class classification and third integer represents the number of epochs for training.

Describe your change:

• [x] Add an algorithm? - Yes [train and test a MNIST dataset using a modified AlexNet model]
• [ ] Fix a bug or typo in an existing algorithm? - [No]
• [ ] Add or change doctests? -- Note: Please avoid changing both code and tests in a single pull request.
• [ ] Documentation change? - [No]

Checklist:

• [x] I have read CONTRIBUTING.md.
• [x] This pull request is all my own work -- I have not plagiarized.
• [x] I know that pull requests will not be merged if they fail the automated tests.
• [x] This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• [x] All new Python files are placed inside an existing directory.
• [x] All filenames are in all lowercase characters with no spaces or dashes.
• [x] All functions and variable names follow Python naming conventions.
• [x] All function parameters and return values are annotated with Python type hints.
• [x] All functions have doctests that pass the automated testing.
• [x] All new algorithms include at least one URL that points to Wikipedia or another similar explanation.
• [x] If this pull request resolves one or more open issues then the description above includes the issue number(s) with a closing keyword: "Fixes #ISSUE-NUMBER".

[blackeye735]

The doctests are given. The comments are given and resolved for each function and variables.

[blackeye735]

@algorithms-keeper review

[blackeye735]

modified the file

[blackeye735]

modified the code.

[cclauss]

Closing require_type_hints PRs to prepare for Hacktoberfest