Table Of Contents
Table Of Contents


class mxnet.gluon.contrib.nn.SparseEmbedding(input_dim, output_dim, dtype='float32', weight_initializer=None, **kwargs)[source]

Turns non-negative integers (indexes/tokens) into dense vectors of fixed size. eg. [4, 20] -> [[0.25, 0.1], [0.6, -0.2]]

This SparseBlock is designed for distributed training with extremely large input dimension. Both weight and gradient w.r.t. weight are RowSparseNDArray.

Note: if sparse_grad is set to True, the gradient w.r.t weight will be sparse. Only a subset of optimizers support sparse gradients, including SGD, AdaGrad and Adam. By default lazy updates is turned on, which may perform differently from standard updates. For more details, please check the Optimization API at:

  • input_dim (int) – Size of the vocabulary, i.e. maximum integer index + 1.
  • output_dim (int) – Dimension of the dense embedding.
  • dtype (str or np.dtype, default 'float32') – Data type of output embeddings.
  • weight_initializer (Initializer) – Initializer for the embeddings matrix.
  • Inputs
    • data: (N-1)-D tensor with shape: (x1, x2, …, xN-1).
  • Output
    • out: N-D tensor with shape: (x1, x2, …, xN-1, output_dim).
__init__(input_dim, output_dim, dtype='float32', weight_initializer=None, **kwargs)[source]

Initialize self. See help(type(self)) for accurate signature.


__init__(input_dim, output_dim[, dtype, …]) Initialize self.
apply(fn) Applies fn recursively to every child block as well as self.
cast(dtype) Cast this Block to use another data type.
collect_params([select]) Returns a ParameterDict containing this Block and all of its children’s Parameters(default), also can returns the select ParameterDict which match some given regular expressions.
forward(x) Overrides to implement forward computation using NDArray.
hybridize([active]) Activates or deactivates HybridBlock s recursively.
initialize([init, ctx, verbose, force_reinit]) Initializes Parameter s of this Block and its children.
load_parameters(filename[, ctx, …]) Load parameters from file previously saved by save_parameters.
load_params(filename[, ctx, allow_missing, …]) [Deprecated] Please use load_parameters.
name_scope() Returns a name space object managing a child Block and parameter names.
register_child(block[, name]) Registers block as a child of self.
register_forward_hook(hook) Registers a forward hook on the block.
register_forward_pre_hook(hook) Registers a forward pre-hook on the block.
save_parameters(filename) Save parameters to file.
save_params(filename) [Deprecated] Please use save_parameters.
summary(*inputs) Print the summary of the model’s output and parameters.


name Name of this Block, without ‘_’ in the end.
params Returns this Block’s parameter dictionary (does not include its children’s parameters).
prefix Prefix of this Block.