grussiameseencoder.py 文件源码

def __init__(self, embedding_size: int, vocabulary_size: int, empirical_distribution, representation_size: int,
                 hyperparameters: dict, encoder_type: str, name: str = "GRUSequenceSiameseEncoder", use_centroid=False):
        self.__hyperparameters = hyperparameters
        self.__name = name
        log_init_noise = self.__hyperparameters["log_init_noise"]

        self.__memory_size = representation_size
        self.__embedding_size = embedding_size
        self.__vocabulary_size = vocabulary_size
        self.__empirical_distribution = empirical_distribution
        self.__encoder_type = encoder_type

        embeddings = np.random.randn(vocabulary_size, embedding_size) * 10 ** log_init_noise
        self.__embeddings = theano.shared(embeddings.astype(theano.config.floatX), name=name + ":embeddings")
        self.__name_bias = theano.shared(np.log(empirical_distribution).astype(theano.config.floatX),
                                         name=name + ":name_bias")

        encoder_init_state = np.random.randn(representation_size) * 10 ** log_init_noise
        self.__encoder_init_state = theano.shared(encoder_init_state.astype(theano.config.floatX),
                                                  name=name + ":encoder_init_state")

        self.__rng = RandomStreams()

        self.__input_sequence = T.ivector(name + ":input_sequence")

        if encoder_type == 'gru':
            self.__encoder = GRU(self.__embeddings, representation_size, embedding_size,
                                 self.__hyperparameters, self.__rng, name=name + ":GRUSequenceEncoder",
                                 use_centroid=use_centroid)
        elif encoder_type == 'averaging_gru':
            self.__encoder = AveragingGRU(self.__embeddings, representation_size, embedding_size,
                                          self.__hyperparameters, self.__rng,
                                          name=name + ":AveragingGRUSequenceEncoder", use_centroid=use_centroid)
        else:
            raise Exception("Unrecognized encoder type `%s`, possible options `gru` and `averaging_gru`")

        self.__params = {"embeddings": self.__embeddings,
                         "encoder_init_state": self.__encoder_init_state}
        self.__params.update(self.__encoder.get_params())