add NEWS; depend on dev reticulate

Author: t-kalinowski

DESCRIPTION

@@ -29,7 +29,7 @@ Depends:
     R (>= 4.0)
 Imports:
     generics (>= 0.0.1),
-    reticulate (>= 1.36.0),
+    reticulate (>= 1.40.0.9000),
     tensorflow (>= 2.16.0),
     tfruns (>= 1.5.2),
     magrittr,
@@ -54,3 +54,5 @@ Suggests:
     jpeg
 RoxygenNote: 7.3.2
 VignetteBuilder: knitr
+Remotes:  
+    rstudio/reticulate

NEWS.md

@@ -1,5 +1,11 @@
 # keras3 (development version)
 
+- Keras now uses `reticulate::py_require()` to resolve Python dependencies.
+  Calling `install_keras()` is no longer required (but is still supported).
+  
+- `use_backend()` gains a `gpu` argument, to specify if a GPU-capable set of 
+  dependencies should be resolved by `py_require()`. 
+
 ## Added compatibility with Keras v3.8.0. User-facing changes:
 
 - New symbols:

R/install.R

@@ -288,7 +288,7 @@ use_backend <- function(backend, gpu = NA) {
 
 
 get_os <- function() {
-  if(is_windows()) "Windows" else if (is_mac_arm64()) "macOS" else "Linux"
+  if (is_windows()) "Windows" else if (is_mac_arm64()) "macOS" else "Linux"
 }
 
 is_keras_loaded <- function() {