Running examples in 'BKTR-Ex.R' failed
The error most likely occurred in:

> ### Name: BKTRRegressor
> ### Title: R6 class encapsulating the BKTR regression elements
> ### Aliases: BKTRRegressor
> 
> ### ** Examples
> 
> ## Don't show: 
> if (torch::torch_is_installed()) (if (getRversion() >= "3.4") withAutoprint else force)({ # examplesIf
+ ## End(Don't show)
+ # Create a BIXI data collection instance containing multiple dataframes
+ bixi_data <- BixiData$new(is_light = TRUE) # Use light version for example
+ 
+ # Create a BKTRRegressor instance
+ bktr_regressor <- BKTRRegressor$new(
+   formula = nb_departure ~ 1 + mean_temp_c + area_park,
+   data_df <- bixi_data$data_df,
+   spatial_positions_df = bixi_data$spatial_positions_df,
+   temporal_positions_df = bixi_data$temporal_positions_df,
+   burn_in_iter = 5, sampling_iter = 10) # For example only (too few iterations)
+ 
+ # Launch the MCMC sampling
+ bktr_regressor$mcmc_sampling()
+ 
+ # Get the summary of the bktr regressor
+ summary(bktr_regressor)
+ 
+ # Get estimated response variables for missing values
+ bktr_regressor$imputed_y_estimates
+ 
+ # Get the list of sampled betas for given spatial, temporal and feature labels
+ bktr_regressor$get_iterations_betas(
+   spatial_label = bixi_data$spatial_positions_df$location[1],
+   temporal_label = bixi_data$temporal_positions_df$time[1],
+   feature_label = 'mean_temp_c')
+ 
+ # Get the summary of all betas for the 'mean_temp_c' feature
+ bktr_regressor$get_beta_summary_df(feature_labels = 'mean_temp_c')
+ ## Don't show: 
+ }) # examplesIf
> bixi_data <- BixiData$new(is_light = TRUE)
> bktr_regressor <- BKTRRegressor$new(formula = nb_departure ~ 1 + mean_temp_c + 
+     area_park, data_df <- bixi_data$data_df, spatial_positions_df = bixi_data$spatial_positions_df, 
+     temporal_positions_df = bixi_data$temporal_positions_df, burn_in_iter = 5, sampling_iter = 10)
Error in cpp_torch_float64() : 
  Lantern is not loaded. Please use `install_torch()` to install additional dependencies.
Calls: <Anonymous> ... <Anonymous> -> <Anonymous> -> <Anonymous> -> cpp_torch_float64
Execution halted