$[9]$:NameErrorCell In $[9],$ line $1$Traceback $($most recent call last$)$rarr$1$ X$\_$train $=$ vectorizer.fit$\_$transform$($posts$)2$ num$\_$samples, num$\_$features $=$ X$\_$train. shape$3$ print$("$#samples: $\%$d$,$ #features: $\%$d$"\%($num$\_$samples, num$\_$features$))$

NameError: name 'posts' is not defined

$[26]$: print$($vectorizer$.$get$\_$feature$\_$names$\_$out$())$

$[\text{'}$disk$\text{'}$ 'format' 'hard' 'how' $\text{'}$my$\text{'}$ 'problems' $\text{'}$to$\text{'}]$

$[27]$:$[9]$:NameErrorCell In $[9],$ line $1$Traceback $($most recent call last$)$rarr$1$ X$\_$train $=$ vectorizer.fit$\_$transform$($posts$)2$ num$\_$samples, num$\_$features $=$ X$\_$train. shape$3$ print$("$#samples: $\%$d$,$ #features: $\%$d$"\%($num$\_$samples, num$\_$features$))$

NameError: name 'posts' is not defined

$[26]$: print$($vectorizer$.$get$\_$feature$\_$names$\_$out$())$

$[\text{'}$disk$\text{'}$ 'format' 'hard' 'how' $\text{'}$my$\text{'}$ 'problems' $\text{'}$to$\text{'}]$

$[27]$: