Class LayerList

tensorlayer/layers/core.py:563–708

The class :class:`LayerList` is a linear stack of layers. The :class:`LayerList` can be created by passing a list of layer instances. The given layer instances will be automatically connected one by one. Parameters ---------- layers: list of Layer A list of layers.

class LayerList(Layer):
    """
    The class :class:`LayerList` is a linear stack of layers.

    The :class:`LayerList` can be created by passing a list of layer instances.
    The given layer instances will be automatically connected one by one.

    Parameters
    ----------
    layers: list of Layer
        A list of layers.
    name : str or None
        A unique layer name. If None, a unique name will be automatically assigned.

    Methods
    ---------
    __init__()
        Initializing the LayerList.
    weights()
        A collection of weights of all the layer instances.
    build()
        Build the LayerList. The layer instances will be connected automatically one by one.
    forward()
        Forward the computation. The computation will go through all layer instances.
    """

    def __init__(self, layers, name=None):
        """
        Initializing the LayerList given a list of Layer.

        :param layers: list of Layer
        :param name: str or None
        """

        super(LayerList, self).__init__(name=name)
        self.layers = layers

        is_built = True
        for layer in self.layers:
            self._trainable_weights.extend(layer.trainable_weights)
            self._nontrainable_weights.extend(layer.nontrainable_weights)
            if layer._built is False:
                is_built = False
            if layer._built and layer.all_weights is not None:
                # some layers in the list passed in have already been built
                # e.g. using input shape to construct layers in dynamic eager
                if self._all_weights is None:
                    self._all_weights = list()
                self._all_weights.extend(layer.all_weights)
        if is_built:
            self._built = True

        logging.info(
            "LayerList %s including layers [%s]" % (self.name, ', '.join([layer.name for layer in self.layers]))
        )

        # check layer name uniqueness in LayerList
        local_layer_name_set = set()