tensorflow 2.9.0

• Generic method updates:

  • New methods:
    all(), any(), sum(), prod(), min(), max(), mean(), range(),
    cbind(), rbind(), t(), aperm(), sort(),
    as.vector(), as.character(), as.raster(),
    is.infinite(), is.finite(), is.nan()
  • ^ will now invoke tf.square() or tf.sqrt() directly when appropriate
  • |, &, and ! now cast arguments to 'bool' dtype.
  • print() now shows 1d shapes without a trailing commas.
  • str() method for tensors now returns only a single compact line;
    str() on a list of tensors now does something sensible.

• install_tensorflow() now install TensorFlow 2.9 by default.

• install_tensorflow() no longer requires conda on Windows, now works in a regular venv.

• Comparing two partially-defined TensorShape now returns TRUE if each dimension matches.
  e.g.: shape(NA, 4) == shape(NA, 4) now returns TRUE, previously FALSE.

• Tensors with dtype 'string' now convert to R character vectors by methods
  as.array() and as.matrix(). (previously they converted to python.builtin.bytes,
  or an R list of python.builtin.bytes objects)

• as_tensor():

  • atomic R integer vectors now convert to 'int32', not 'int64'
  • casting between integer and floating dtypes is now done via
    tf$dtypes$saturate_cast() instead of tf$cast().
  • shape argument now accepts a tensor.
  • fixed issue where expanding a scalar tensor to an nd-array with
    shape provided as a tensor would raise an error.

• tf.SparseTensor objects now inherit from "tensorflow.tensor".