Our search space consists of two stackable cells, one for the model encoder and one for the decoder Each cell contains NASNet-style blocks, which receive two hidden state inputs and produce new hidden states as outputs  Our search space contains five branch-level search fields (input, normalization, layer, output dimension and activation), one block-level search field (combiner function) and one cell-level search field (number of cells). 
 Question: What is in the model search space?
Our search space consists of two stackable cells, one for the model encoder and one for the decoder  Each cell contains NASNet-style blocks, which receive two hidden state inputs and produce new hidden states as outputs Our search space contains five branch-level search fields (input, normalization, layer, output dimension and activation), one block-level search field (combiner function) and one cell-level search field (number of cells).