mlpack_det: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/mlpack_det - from package: mlpack-bin

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/mlpack_det - from package: mlpack-bin

You may install the required package with command apt-get install {package}

Error in other languages:
mlpack_det: bevel nie gevind nie
mlpack_det: comandă negăsită
mlpack_det: comando não encontrado
mlpack_det: commande introuvable
mlpack_det: command not found
mlpack_det: käsku ei ole
mlpack_det: không tìm thấy lệnh
mlpack_det: komanda nerasta
mlpack_det: Kommando nicht gefunden.
mlpack_det: kommandot finns inte
mlpack_det: komut yok
mlpack_det: nie znaleziono polecenia
mlpack_det: níor aimsíodh an t-ordú
mlpack_det: no se encontró la orden
mlpack_det: no s'ha trobat l'ordre
mlpack_det: opdracht niet gevonden
mlpack_det: parancs nem található
mlpack_det: perintah tidak ditemukan
mlpack_det: príkaz nenájdený
mlpack_det: příkaz nenalezen
mlpack_det: команда не найдена
mlpack_det: командата не е открита
mlpack_det: 命令找不到
mlpack_det: コマンドが見つかりません