.foreach_regfun: no visible global function definition for
  ‘getS3method’
.wrapResult: no visible global function definition for ‘exprs’
hash_function: no visible global function definition for
  ‘capture.output’
nmfInfo: no visible global function definition for ‘packageDescription’
nmfReport : nmfRun: no visible global function definition for ‘str’
print.foreach_backend: no visible global function definition for ‘str’
setupLibPaths: no visible global function definition for
  ‘capture.output’
setupTempDirectory: no visible global function definition for
  ‘file_test’
staticVar: no visible global function definition for ‘capture.output’
str_args: no visible global function definition for ‘capture.output’
txtProgressBar : up1: no visible global function definition for
  ‘flush.console’
txtProgressBar : up2: no visible global function definition for
  ‘flush.console’
txtProgressBar : up3: no visible global function definition for
  ‘flush.console’
txtProgressBar : kill: no visible global function definition for
  ‘flush.console’
nmf,matrix-numeric-NMFStrategy: no visible global function definition
  for ‘capture.output’
nmf,matrix-numeric-NMFStrategy : run.all: no visible global function
  definition for ‘setTxtProgressBar’
nmf,matrix-numeric-NMFStrategy : run.all: no visible global function
  definition for ‘file_test’
nmfModel,formula-ANY : merge_pdata: no visible global function
  definition for ‘pData’
nmfModel,formula-ANY: no visible global function definition for ‘exprs’
seed,ANY-list-NMFSeed: no visible global function definition for
  ‘capture.output’
show,NMFfit: no visible global function definition for ‘capture.output’
Undefined global functions or variables:
  capture.output exprs file_test flush.console getS3method pData
  packageDescription setTxtProgressBar str
Consider adding
  importFrom("utils", "capture.output", "file_test", "flush.console",
             "getS3method", "packageDescription", "setTxtProgressBar",
             "str")
to your NAMESPACE file.