Update transfer_learning.md
Update transfer_learning.md

googlecodelabs/odml-pathways,googlecodelabs/odml-pathways,tensorflow/codelabs,tensorflow/codelabs,tensorflow/codelabs,tensorflow/codelabs,googlecodelabs/odml-pathways,googlecodelabs/odml-pathways,tensorflow/codelabs,googlecodelabs/odml-pathways,tensorflow/codelabs,googlecodelabs/odml-pathways,tensorflow/codelabs