Removed deprecation warnings of input_length argument and HDF5 format of model saving

[shristirwt]

Issue Reference: Fixes #193

Description of changes: I updated the code to remove deprecation warnings of input_length argument and HDF5 format of model saving

[github-actions]

Thank you for submitting your pull request! 🙌 We'll review it as soon as possible. In the meantime, please ensure that your changes align with our chaotic CONTRIBUTING.md. If there are any specific instructions or feedback regarding your PR, we'll provide them here. Thanks again for your contribution! 😊

[Mayureshd-18]

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Thanks & regards

[shristirwt]

I have made the changes

[github-actions]

🎉🎉 Thank you for your contribution! Your PR #197 has been merged! 🎉🎉