@staticmethod<EOL><INDENT>def validate_stores_secrets_keys(stores_secrets):<DEDENT>
stores = set([])<EOL>for store_secret in stores_secrets:<EOL><INDENT>if store_secret['<STR_LIT:store>'] in stores:<EOL><INDENT>raise TensorboardValidation('<STR_LIT>')<EOL><DEDENT>elif store_secret['<STR_LIT:store>'] not in {GCS, S3}:<EOL><INDENT>raise TensorboardValidation('<STR_LIT>')<EOL><DEDENT>stores.add(store_secret['<STR_LIT:store>'])<EOL><DEDENT>
Validates that we can only authenticate to one S3 and one GCS.