Refactor add quick check before import tensorflow

[gogetron]

Summary

🎯 Purpose: Avoid tensorflow import when X is None / numpy / pandas / list data.

[ ✏️ Write your summary here. ]
When the function assert_valid_inputs is called we default to import tensorflow to check if the provided data is a tensorflow dataset. However the first tensorflow import is slow and we could quickly check for other common inputs first. By adding this quick check we can skip the tensorflow import unless it is likely that the provided data is a tensorflow dataset. The performance impact of this check is ~40ns in my laptop when the data is actually a tensorflow dataset and it is about the same performance improvement when X is None / numpy / pandas / list and tensorflow was already imported before.

Impact

🌐 Areas Affected: The assert_valid_input function is called by many modules, thus we would skip the tensorflow import for most workflows that do not need it.

Testing

🔍 Testing Done: Existing test suite.

References

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.15%. Comparing base (abd0924) to head (97c580d).
Report is 1 commits behind head on master.

Additional details and impacted files

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  Coverage   96.15%   96.15%           
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  Files          74       74           
  Lines        5850     5850           
  Branches     1044     1044           
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  Hits         5625     5625           
  Misses        134      134           
  Partials       91       91           

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