Add a base class Text2TextRemotedir for easy adding of problems with data in a persistent remote directory (GCS bucket).
Add a base class Text2TextRemotedir for easy adding of problems with data in a persistent remote directory (GCS bucket).

PiperOrigin-RevId: 209962813

tensorflow/tensor2tensor,tensorflow/tensor2tensor,vthorsteinsson/tensor2tensor,vthorsteinsson/tensor2tensor,tensorflow/tensor2tensor,tensorflow/tensor2tensor,vthorsteinsson/tensor2tensor,tensorflow/tensor2tensor,vthorsteinsson/tensor2tensor