keras 2.8.0

• Breaking change: The semantics of passing a named list to keras_model() have changed.

  Previously, keras_model() would unname() supplied inputs and outputs.
  Then, if a named list was passed to subsequent fit()/evaluate()/call()/predict() invocations, matching of x and y was done to the model's input and outpt tensor$name's.
  Now, matching is done to names() of inputs and/or outputs supplied to keras_model().
  Call unname() on inputs and outputs to restore the old behavior, e.g.:

  keras_model(unname(inputs), unname(outputs))
  

  keras_model() can now accept a named list for multi-input and/or multi-output
  models. The named list is converted to a dict in python.
  (Requires Tensorflow >= 2.4, Python >= 3.7).

  If inputs is a named list:

  • call(), fit(), evaluate(), and predict() methods can also
    accept a named list for x, with names matching to the
    names of inputs when the model was constructed.
    Positional matching of x is still also supported (requires python 3.7+).

  If outputs is a named list:

  • fit() and evaluate() methods can only
    accept a named list for y, with names matching to the
    names of outputs when the model was constructed.

• New layer layer_depthwise_conv_1d().

• Models gain format() and print() S3 methods for compatibility
  with the latest reticulate. Both are powered by model$summary().

• summary() method for Models gains arguments expand_nested and show_trainable,
  both default to FALSE.

• keras_model_custom() is soft deprecated. Please define custom models by
  subclassing keras$Model directly using %py_class% or R6::R6Class().

• Fixed warning issued by k_random_binomial().

• Fixed error raised when k_random_binomial() was passed a non-floating dtype.

• Added k_random_bernouli() as an alias for k_random_binomial().

• image_load() gains a color_mode argument.

• Fixed issue where create_layer_wrapper() would not include arguments
  with a NULL default value in the returned wrapper.

• Fixed issue in r_to_py.R6ClassGenerator (and %py_class%) where
  single-expression initialize functions defined without { would error.

• Deprecated functions are no longer included in the package documentation index.