Validate the similarity between training dataset and validation dataset Schema

**Is your feature request related to a problem? Please describe.**

**Describe the solution you'd like**
When the user wants to pass a separate validation dataset file. The two-dataset schema (train & validate) should be the same before we proceed to train.

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

**Additional context**
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