keras_simple_lstm: keras simple lstm
In systats/textlearnR:

Word embedding + (bidirectional) long short-term memory

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keras_simple_lstm(input_dim, embed_dim = 128, seq_len = 50,
  lstm_dim = 64, lstm_drop = 0.2, dropout = 0.2, bidirectional = F,
  output_dim = 2, output_fun = "softmax")

`input_dim`	Number of unique vocabluary/tokens
`embed_dim`	Number of word vectors
`seq_len`	Length of the input sequences
`lstm_dim`	Number of recurrent neurons (default 64)
`lstm_drop`	Recurrent dropout ratio
`bidirectional`	default is F
`output_dim`	Number of neurons of the output layer
`output_fun`	Output activation function