dnn_estimators: Deep Neural Networks
In rstudio/tflearn: Interface to 'TensorFlow' Estimators

Create a deep neural network (DNN) estimator.

dnn_regressor(
  hidden_units,
  feature_columns,
  model_dir = NULL,
  label_dimension = 1L,
  weight_column = NULL,
  optimizer = "Adagrad",
  activation_fn = "relu",
  dropout = NULL,
  input_layer_partitioner = NULL,
  config = NULL
)

dnn_classifier(
  hidden_units,
  feature_columns,
  model_dir = NULL,
  n_classes = 2L,
  weight_column = NULL,
  label_vocabulary = NULL,
  optimizer = "Adagrad",
  activation_fn = "relu",
  dropout = NULL,
  input_layer_partitioner = NULL,
  config = NULL
)

`hidden_units`	An integer vector, indicating the number of hidden units in each layer. All layers are fully connected. For example, `c(64, 32)` means the first layer has 64 nodes, and the second layer has 32 nodes.
`feature_columns`	An R list containing all of the feature columns used by the model (typically, generated by `feature_columns()`).
`model_dir`	Directory to save the model parameters, graph, and so on. This can also be used to load checkpoints from the directory into a estimator to continue training a previously saved model.
`label_dimension`	Number of regression targets per example. This is the size of the last dimension of the labels and logits `Tensor` objects (typically, these have shape `[batch_size, label_dimension]`).
`weight_column`	A string, or a numeric column created by `column_numeric()` defining feature column representing weights. It is used to down weight or boost examples during training. It will be multiplied by the loss of the example. If it is a string, it is used as a key to fetch weight tensor from the `features` argument. If it is a numeric column, then the raw tensor is fetched by key `weight_column$key`, then `weight_column$normalizer_fn` is applied on it to get weight tensor.
`optimizer`	Either the name of the optimizer to be used when training the model, or a TensorFlow optimizer instance. Defaults to the Adagrad optimizer.
`activation_fn`	The activation function to apply to each layer. This can either be an actual activation function (e.g. `tf$nn$relu`), or the name of an activation function (e.g. `"relu"`). Defaults to the `"relu"` activation function. See https://www.tensorflow.org/versions/r1.15/api_docs/python/tf/nn for documentation related to the set of activation functions available in TensorFlow.
`dropout`	When not `NULL`, the probability we will drop out a given coordinate.
`input_layer_partitioner`	An optional partitioner for the input layer. Defaults to `min_max_variable_partitioner` with `min_slice_size` 64 << 20.
`config`	A run configuration created by `run_config()`, used to configure the runtime settings.
`n_classes`	The number of label classes.
`label_vocabulary`	A list of strings represents possible label values. If given, labels must be string type and have any value in `label_vocabulary`. If it is not given, that means labels are already encoded as integer or float within `[0, 1]` for `n_classes == 2` and encoded as integer values in `{0, 1,..., n_classes -1}` for `n_classes > 2`. Also there will be errors if vocabulary is not provided and labels are string.