message: Update Configuration File session in README.md
diff: @@ -158,12 +158,12 @@ Arguments:
  Totally three kinds of files will be used as input of HugeCTR Training: configuration file (.json), model file, data set.
  ### Configuration File ###
  -Configuration file should be a json format file e.g. [simple_sparse_embedding.json](utest/session/simple_sparse_embedding.json)
  +Configuration file should be a json format file e.g. [simple_sparse_embedding.json](utest/simple_sparse_embedding.json)
  -There are four sessions in a configuration file: "solver", "optimizer", "data", "layers". The sequence of these sessions is not restricted.
  +There are three sessions in a configuration file: "solver", "optimizer", "layers". The sequence of these sessions is not restricted.
  * You can specify the device (or devices), batchsize, model_file.. in `solver` session;
  * and the `optimizer` that will be used in every layer.
  -* Finally, layers should be listed under `layers`. Note that embedders should always be the first layers.
  +* Finally, layers should be listed under `layers`. Note that data layer should always be the first layer and embeddings should be the second.
  ### Model File ###
  Model file is a binary file that will be loaded for weight initilization.
  