Constructs SLMConfig.
(self,
vocab_size,
embedding_size=256,
hidden_size=256,
max_segment_length=4,
encoder_layer_number=1,
decoder_layer_number=1,
encoder_input_dropout_rate=0.0,
decoder_input_dropout_rate=0.0,
encoder_dropout_rate=0.0,
decoder_dropout_rate=0.0,
punc_id=2,
num_id=3,
eos_id=5,
eng_id=7)