Rails is famous for being easy to get started. With scaffolding, helpers and the fantastic ActiveRecord library you can put things together in no time. Is there a high level Machine Learning framework in the spirit of Rails?
Here are some that I use
Shedding Light on Black Box Machine Learning Algorithms: Development of an Axiomatic Framework to Assess the Quality of Methods that Explain Individual Predictions
https://arxiv.org/abs/1808.05054
Manifold: A Model-Agnostic Framework for Interpretation and Diagnosis of Machine Learning Models
https://arxiv.org/abs/1808.00196
I would say tensorflow is the anthesis of "convention over configuration" rails is lauded for! w/ TF relative to most frameworks, you have to configure all the boilerplate!
If you're looking for a higher-level approach a lot of the community likes sci-kit which has lots of nice defaults for popular models.
Manifold: A Model-Agnostic Framework for Interpretation and Diagnosis of Machine Learning Models https://arxiv.org/abs/1808.00196
Neither are for Deep Learnng or Neural Networks