Update handling of show_messages, add show_exceptions

R/model.R

@@ -1054,6 +1054,7 @@ sample <- function(data = NULL,
                    window = NULL,
                    fixed_param = FALSE,
                    show_messages = TRUE,
+                   show_exceptions = TRUE,
                    diagnostics = c("divergences", "treedepth", "ebfmi"),
                    # deprecated
                    cores = NULL,
@@ -1123,7 +1124,8 @@ sample <- function(data = NULL,
     num_procs = checkmate::assert_integerish(chains, lower = 1, len = 1),
     parallel_procs = checkmate::assert_integerish(parallel_chains, lower = 1, null.ok = TRUE),
     threads_per_proc = assert_valid_threads(threads_per_chain, self$cpp_options(), multiple_chains = TRUE),
-    show_stderr_messages = show_messages
+    show_stderr_messages = show_exceptions,
+    show_stdout_messages = show_messages
   )
   model_variables <- NULL
   if (is_variables_method_supported(self)) {
@@ -1260,6 +1262,7 @@ sample_mpi <- function(data = NULL,
                        fixed_param = FALSE,
                        sig_figs = NULL,
                        show_messages = TRUE,
+                       show_exceptions = TRUE,
                        diagnostics = c("divergences", "treedepth", "ebfmi"),
                        # deprecated
                        validate_csv = TRUE) {
@@ -1282,7 +1285,8 @@ sample_mpi <- function(data = NULL,
   procs <- CmdStanMCMCProcs$new(
     num_procs = checkmate::assert_integerish(chains, lower = 1, len = 1),
     parallel_procs = 1,
-    show_stderr_messages = show_messages
+    show_stderr_messages = show_exceptions,
+    show_stdout_messages = show_messages
   )
   model_variables <- NULL
   if (is_variables_method_supported(self)) {

R/run.R

@@ -362,9 +362,13 @@ check_target_exe <- function(exe) {
     }
   }
   if (is.null(procs$threads_per_proc())) {
-    cat(paste0(start_msg, "...\n\n"))
+    if (procs$show_stdout_messages()) {
+      cat(paste0(start_msg, "...\n\n"))
+    }
   } else {
-    cat(paste0(start_msg, ", with ", procs$threads_per_proc(), " thread(s) per chain...\n\n"))
+    if (procs$show_stdout_messages()) {
+      cat(paste0(start_msg, ", with ", procs$threads_per_proc(), " thread(s) per chain...\n\n"))
+    }
     Sys.setenv("STAN_NUM_THREADS" = as.integer(procs$threads_per_proc()))
     # Windows environment variables have to be explicitly exported to WSL
     if (os_is_wsl()) {
@@ -425,9 +429,13 @@ CmdStanRun$set("private", name = "run_sample_", value = .run_sample)
     }
   }
   if (is.null(procs$threads_per_proc())) {
-    cat(paste0(start_msg, "...\n\n"))
+    if (procs$show_stdout_messages()) {
+      cat(paste0(start_msg, "...\n\n"))
+    }
   } else {
-    cat(paste0(start_msg, ", with ", procs$threads_per_proc(), " thread(s) per chain...\n\n"))
+    if (procs$show_stdout_messages()) {
+      cat(paste0(start_msg, ", with ", procs$threads_per_proc(), " thread(s) per chain...\n\n"))
+    }
     Sys.setenv("STAN_NUM_THREADS" = as.integer(procs$threads_per_proc()))
     # Windows environment variables have to be explicitly exported to WSL
     if (os_is_wsl()) {
@@ -612,6 +620,12 @@ CmdStanProcs <- R6::R6Class(
       private$show_stdout_messages_ <- show_stdout_messages
       invisible(self)
     },
+    show_stdout_messages = function () {
+      private$show_stdout_messages_
+    },
+    show_stderr_messages = function () {
+      private$show_stderr_messages_
+    },
     num_procs = function() {
       private$num_procs_
     },
@@ -927,7 +941,7 @@ CmdStanMCMCProcs <- R6::R6Class(
               || grepl("stancflags", line, fixed = TRUE)) {
             ignore_line <- TRUE
           }
-          if ((state > 1.5 && state < 5 && !ignore_line) || is_verbose_mode()) {
+          if ((state > 1.5 && state < 5 && !ignore_line && private$show_stdout_messages_) || is_verbose_mode()) {
             if (state == 2) {
               message("Chain ", id, " ", line)
             } else {
@@ -939,7 +953,9 @@ CmdStanMCMCProcs <- R6::R6Class(
             if (state == 1) {
               state <- 2;
             }
-            message("Chain ", id, " ", line)
+            if (private$show_stderr_messages_) {
+              message("Chain ", id, " ", line)
+            }
           }
           private$proc_state_[[id]] <- next_state
         } else {
@@ -951,6 +967,9 @@ CmdStanMCMCProcs <- R6::R6Class(
       invisible(self)
     },
     report_time = function(id = NULL) {
+      if (!private$show_stdout_messages_) {
+        return(invisible(NULL))
+      }
       if (!is.null(id)) {
         if (self$proc_state(id) == 7) {
           warning("Chain ", id, " finished unexpectedly!\n", immediate. = TRUE, call. = FALSE)
@@ -1030,7 +1049,7 @@ CmdStanGQProcs <- R6::R6Class(
         if (nzchar(line)) {
           if (self$proc_state(id) == 1 && grepl("refresh = ", line, perl = TRUE)) {
             self$set_proc_state(id, new_state = 1.5)
-          } else if (self$proc_state(id) >= 2) {
+          } else if (self$proc_state(id) >= 2 && private$show_stdout_messages_) {
             cat("Chain", id, line, "\n")
           }
         } else {
@@ -1044,6 +1063,9 @@ CmdStanGQProcs <- R6::R6Class(
       invisible(self)
     },
     report_time = function(id = NULL) {
+      if (!private$show_stdout_messages_) {
+        return(invisible(NULL))
+      }
       if (!is.null(id)) {
         if (self$proc_state(id) == 7) {
           warning("Chain ", id, " finished unexpectedly!\n", immediate. = TRUE, call. = FALSE)

man-roxygen/model-sample-args.R

@@ -75,6 +75,10 @@
 #'   `fixed_param=TRUE` is mandatory. When `fixed_param=TRUE` the `chains` and
 #'   `parallel_chains` arguments will be set to `1`.
 #' @param show_messages (logical) When `TRUE` (the default), prints all
+#'   output during the sampling process, such as iteration numbers and elapsed times.
+#'   If the output is silenced then the [`$output()`][fit-method-output] method of
+#'   the resulting fit object can be used to display the silenced messages.
+#' @param show_exceptions (logical) When `TRUE` (the default), prints all
 #'   informational messages, for example rejection of the current proposal.
 #'   Disable if you wish to silence these messages, but this is not usually
 #'   recommended unless you are very confident that the model is correct up to

tests/testthat/test-model-sample.R

@@ -118,7 +118,7 @@ test_that("sample() method runs when the stan file is removed", {
   )
 })
 
-test_that("sample() prints informational messages depening on show_messages", {
+test_that("sample() prints informational messages depening on show_exceptions", {
   mod_info_msg <- testing_model("info_message")
   expect_sample_output(
     expect_message(
@@ -127,7 +127,7 @@ test_that("sample() prints informational messages depening on show_messages", {
     )
   )
   expect_sample_output(
-    expect_message(mod_info_msg$sample(show_messages = FALSE), regexp = NA)
+    expect_message(mod_info_msg$sample(show_exceptions = FALSE), regexp = NA)
   )
 })
 
@@ -321,3 +321,44 @@ test_that("sig_figs warning if version less than 2.25", {
   )
   reset_cmdstan_version()
 })
+
+test_that("Errors are suppressed with show_exceptions", {
+  errmodcode <- "
+  data {
+    real y_mean;
+  }
+  transformed data {
+    vector[1] small;
+    small[2] = 1.0;
+  }
+  parameters {
+    real y;
+  }
+  model {
+    y ~ normal(y_mean, 1);
+  }
+  "
+  errmod <- cmdstan_model(write_stan_file(errmodcode), force_recompile = TRUE)
+
+  expect_message(
+    suppressWarnings(errmod$sample(data = list(y_mean = 1), chains = 1)),
+    "Chain 1 Exception: vector[uni] assign: accessing element out of range",
+    fixed = TRUE
+  )
+
+  expect_no_message(
+    suppressWarnings(errmod$sample(data = list(y_mean = 1), chains = 1, show_exceptions = FALSE))
+  )
+})
+
+test_that("All output can be suppressed by show_messages", {
+  stan_program <- testing_stan_file("bernoulli")
+  data_list <- testing_data("bernoulli")
+  mod <- cmdstan_model(stan_program, force_recompile = TRUE)
+  options("cmdstanr_verbose" = FALSE)
+  output <- capture.output(
+    fit <- mod$sample(data = data_list, show_messages = FALSE)
+  )
+
+  expect_length(output, 0)
+})