install_keras() fails

[WT215]

Hi,

I am using Windows 8. I installed anaconda3 and run Rstudio from the Navigator. Then I connected anaconda with the base R : "\Anaconda3\lib\R".

I can successfully install keras via: install.packages('keras'). However, when I run install_keras(), I got the following error:

> install_keras()
Error: lexical error: invalid char in json text.
                                       Usage: conda [options] [INPUTFI
                     (right here) ------^
In addition: Warning message:
running command '"D:\ProgramData\Anaconda3\Scripts\conda.exe" info --json' had status 2 

Here are some more details:

> session_info()
Session info ------------------------------------------------------------------
 setting  value                         
 version  R version 3.4.3 (2017-11-30)  
 system   x86_64, mingw32               
 ui       RStudio (1.1.423)             
 language (EN)                          
 collate  Chinese (Simplified)_China.936
 tz       Europe/London                 
 date     2018-04-17                    

Packages ----------------------------------------------------------------------
 package       * version date       source        
 base          * 3.4.3   2018-01-10 local         
 compiler        3.4.3   2018-01-10 local         
 curl            3.1     2017-12-28 local         
 datasets      * 3.4.3   2018-01-10 local         
 devtools      * 1.13.3  2017-08-02 CRAN (R 3.4.1)
 digest          0.6.13  2017-12-14 CRAN (R 3.4.3)
 graphics      * 3.4.3   2018-01-10 local         
 grDevices     * 3.4.3   2018-01-10 local         
 httr            1.3.1   2017-08-20 CRAN (R 3.4.3)
 jsonlite        1.5     2017-06-01 CRAN (R 3.3.2)
 keras         * 2.0.6   2017-08-30 CRAN (R 3.4.1)
 knitr           1.18    2017-12-27 CRAN (R 3.4.3)
 magrittr        1.5     2014-11-22 CRAN (R 3.4.3)
 memoise         1.1.0   2017-04-21 CRAN (R 3.4.1)
 methods       * 3.4.3   2018-01-10 local         
 R6              2.2.2   2017-06-17 CRAN (R 3.3.2)
 Rcpp            0.12.14 2017-11-23 CRAN (R 3.4.3)
 reticulate      1.1     2017-08-26 CRAN (R 3.4.1)
 RevoUtils     * 10.0.8  2018-02-07 local         
 RevoUtilsMath * 10.0.1  2017-09-19 local         
 rsconnect       0.8.5   2017-08-23 CRAN (R 3.4.3)
 stats         * 3.4.3   2018-01-10 local         
 tensorflow      1.3.1   2017-08-26 CRAN (R 3.4.1)
 tfruns          0.9.1   2017-08-24 CRAN (R 3.4.1)
 tools           3.4.3   2018-01-10 local         
 utils         * 3.4.3   2018-01-10 local         
 withr           2.1.1   2017-12-19 CRAN (R 3.4.3)
 yaml            2.1.16  2017-12-12 CRAN (R 3.4.3)

Cheers,
Wenhao

[WT215]

I uninstalled anaconda2, which was installed a long time ago. Then I can run install_keras() successfully.

However, when I proceed to the following code:

> mnist <- dataset_mnist()
D:\ProgramData\Anaconda3\envs\r-tensorflow\lib\site-packages\h5py\__init__.py:36: FutureWarning: Conversion of the second argument of issubdtype from `float` to `np.floating` is deprecated. In future, it will be treated as `np.float64 == np.dtype(float).type`.
  from ._conv import register_converters as _register_converters

Using TensorFlow backend.

Downloading data from
 
https://s3.amazonaws.com/img-datasets/mnist.npz


 Show Traceback
 
 Rerun with Debug
 Error in py_call_impl(callable, dots$args, dots$keywords) : 
  TypeError: 'int' object is not callable 

May I ask what causes these problems?

Many thanks!

[WT215]

I closed another R session, and then rerun > mnist <- dataset_mnist(), and it works!

[PaolaGhione]

Hi,
I got the same trouble when I tried to install keras package in rstudio and I got the following error:

keras::install_keras()
Error: lexical error: invalid char in json text.
WARNING: The conda.compat modul
(right here) ------^

[BrianCollinss]

Same here, with python 3.6.8 on Anaconda.

> library(tensorflow)
> install_tensorflow(version='v1.13',method='conda')
Error: lexical error: invalid char in json text.
                                       WARNING: The conda.compat modul
                     (right here) ------^

[rgurlek]

I got the same error. Any suggestion?

[BrianCollinss]

Follow this: #733 (comment)

[PaolaGhione]

Hi everybody, after many attempts, I got this solution:
1.) installation of R 3.5.2 (independent from directory (standard or any other)
2.) installation of RStudio (independent from directory)
3.) RStudio -> Tools -> Global Options -> Packages -> Disable both "Use secure download method for HTTP" and "Use Internet Explorer library/proxy for HTTP"
4.) installation of Miniconda3 (-> has to be the standard directory!) Version 4.5.11 (it did not work with the newest version)
5.) Use RStudio ->
install.packages("tensorflow")
install.packages("keras")
library("keras")
install_keras()
This worked for me and I am now able to use Keras in R!