[R] [CI] enforce lintr::function_left_parentheses_linter check (#9631)

R-package/R/xgb.Booster.R

@@ -21,13 +21,13 @@ xgb.Booster.handle <- function(params, cachelist, modelfile, handle) {
       ## A memory buffer
       bst <- xgb.unserialize(modelfile, handle)
       xgb.parameters(bst) <- params
-      return (bst)
+      return(bst)
     } else if (inherits(modelfile, "xgb.Booster")) {
       ## A booster object
       bst <- xgb.Booster.complete(modelfile, saveraw = TRUE)
       bst <- xgb.unserialize(bst$raw)
       xgb.parameters(bst) <- params
-      return (bst)
+      return(bst)
     } else {
       stop("modelfile must be either character filename, or raw booster dump, or xgb.Booster object")
     }
@@ -382,7 +382,7 @@ predict.xgb.Booster <- function(object, newdata, missing = NA, outputmargin = FA
       cval[0] <- val
       return(cval)
     }
-    return (val)
+    return(val)
   }
 
   ## We set strict_shape to TRUE then drop the dimensions conditionally

R-package/R/xgb.DMatrix.R

@@ -117,7 +117,7 @@ xgb.get.DMatrix <- function(data, label, missing, weight, nthread) {
       stop("xgboost: invalid input data")
     }
   }
-  return (dtrain)
+  return(dtrain)
 }
 
 

R-package/R/xgb.load.raw.R

@@ -18,6 +18,6 @@ xgb.load.raw <- function(buffer, as_booster = FALSE) {
     booster <- xgb.Booster.complete(booster, saveraw = TRUE)
     return(booster)
   } else {
-    return (handle)
+    return(handle)
   }
 }

R-package/R/xgb.unserialize.R

@@ -37,5 +37,5 @@ xgb.unserialize <- function(buffer, handle = NULL) {
       }
     })
   class(handle) <- "xgb.Booster.handle"
-  return (handle)
+  return(handle)
 }

R-package/R/xgboost.R

@@ -24,7 +24,7 @@ xgboost <- function(data = NULL, label = NULL, missing = NA, weight = NULL,
                    early_stopping_rounds = early_stopping_rounds, maximize = maximize,
                    save_period = save_period, save_name = save_name,
                    xgb_model = xgb_model, callbacks = callbacks, ...)
-  return (bst)
+  return(bst)
 }
 
 #' Training part from Mushroom Data Set