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BM25 cheatsheet

\href{#score}{score}( \href{#D}{D}, \href{#Q}{Q} ) = \displaystyle\href{#sum}{\sum_{i=1}^n} \href{#log}{log} \Big( \frac { \href{#N}{N}- \href{#df}{df(q_i)} \href{#half}{+0,5} } { \href{#df}{df(q_i)} \href{#half}{+0,5} } \Big) \frac { \href{#f}{f(q_i,D)} ( \href{#k1}{k_1} \href{#plusone}{+1} ) } { \href{#f}{f(q_i,D)}+ \href{#k1}{k_1}( \href{#minusb}{1-b}+ \href{#b}{b} \href{#doclength}{ \frac {L} {L_{avg}} } ) }