Apologies for the cross post from the RStudio Keras github repo, but I thought someone here might have an answer, or might be experiencing an issue similar to mine.
I'm getting an error trying to use a keras image generator.
library(keras)
x <- "test_image.png"
img <- image_load(x)
x <- image_to_array(img)
dim(x) <- c(1,dim(x))
gen_images <- image_data_generator(rescale = 1/255,
preprocessing_function = imagenet_preprocess_input
)
images_iter <- flow_images_from_data (
x=x, y=NULL,
generator=gen_images,
batch_size=1,
save_to_dir=images_dir,
save_prefix="aug",
save_format="jpeg"
)
reticulate::iter_next(images_iter)
Results in the following error: Error in py_iter_next(it, completed) : ValueError: output array is read-only
.
The same error occurs when I try to run imagenet_preprocess_input
with a directory as input , e.g.,
train_datagen = image_data_generator(
rescale = 1/255,
horizontal_flip = TRUE,
fill_mode = "nearest",
preprocessing_function = imagenet_preprocess_input
)
train_generator <- flow_images_from_directory(
"./train",
train_datagen,
target_size = c(FLAGS$image_width,FLAGS$image_height),
batch_size = batch_size,
class_mode = "categorical",
follow_links = TRUE
)
Session info:
sessionInfo()
R version 3.6.0 (2019-04-26)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Linux Mint 18.3
Matrix products: default
BLAS: /usr/lib/libblas/libblas.so.3.6.0
LAPACK: /home/dan/anaconda/envs/r-tensorflow/lib/libmkl_rt.so
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 LC_PAPER=en_US.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] keras_2.2.4
loaded via a namespace (and not attached):
[1] compiler_3.6.0 Matrix_1.2-17 magrittr_1.5 R6_2.3.0 generics_0.0.2
[6] tools_3.6.0 whisker_0.3-2 base64enc_0.1-3 Rcpp_1.0.1 reticulate_1.10.0.9003
[11] tensorflow_1.10 grid_3.6.0 zeallot_0.1.0 jsonlite_1.6 tfruns_1.4
[16] lattice_0.20-38