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Graph Network

Source: R/nn_graph.R
nn_graph.Rd

Represents a neural network using a Graph that contains mostly PipeOpModules.

Usage

nn_graph(graph, shapes_in, output_map = graph$output$name, list_output = FALSE)

Arguments

graph

(Graph)
The Graph to wrap. Is not cloned.

shapes_in

(named integer)
Shape info of tensors that go into graph. Names must be graph$input$name, possibly in different order.

output_map

(character)
Which of graph's outputs to use. Must be a subset of graph$output$name.

list_output

(logical(1))
Whether output should be a list of tensors. If FALSE (default), then length(output_map) must be 1.

Value

nn_graph

Fields

  • graph :: Graph
    The graph (consisting primarily of PipeOpModules) that is wrapped by the network.

  • input_map :: character()
    The names of the input arguments of the network.

  • shapes_in :: list()
    The shapes of the input tensors of the network.

  • output_map :: character()
    Which output elements of the graph are returned by the $forward() method.

  • list_output :: logical(1)
    Whether the output is a list of tensors.

  • module_list :: nn_module_list
    The list of modules in the network.

  • list_output :: logical(1)
    Whether the output is a list of tensors.

See also

Other Graph Network: ModelDescriptor(), TorchIngressToken(), mlr_learners_torch_model, mlr_pipeops_module, mlr_pipeops_torch, mlr_pipeops_torch_ingress, mlr_pipeops_torch_ingress_categ, mlr_pipeops_torch_ingress_ltnsr, mlr_pipeops_torch_ingress_num, model_descriptor_to_learner(), model_descriptor_to_module(), model_descriptor_union()

Examples

graph = mlr3pipelines::Graph$new()
graph$add_pipeop(po("module_1", module = nn_linear(10, 20)), clone = FALSE)
graph$add_pipeop(po("module_2", module = nn_relu()), clone = FALSE)
graph$add_pipeop(po("module_3", module = nn_linear(20, 1)), clone = FALSE)
graph$add_edge("module_1", "module_2")
graph$add_edge("module_2", "module_3")

network = nn_graph(graph, shapes_in = list(module_1.input = c(NA, 10)))

x = torch_randn(16, 10)

network(module_1.input = x)
#> torch_tensor
#> -0.0152
#> -0.3504
#> -0.1388
#> -0.4652
#> -0.1513
#> -0.0067
#> -0.2313
#>  0.1544
#> -0.8684
#> -0.1670
#>  0.3500
#>  0.1523
#> -0.0966
#>  0.2170
#>  0.0859
#> -0.4195
#> [ CPUFloatType{16,1} ][ grad_fn = <AddmmBackward0> ]