[doc] Fix link in rank demo README.md . (#3759)

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Saumya Bhatnagar 2018-10-07 00:42:54 +05:30 committed by Philip Hyunsu Cho
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Learning to rank Learning to rank
==== ====
XGBoost supports accomplishing ranking tasks. In ranking scenario, data are often grouped and we need the [group information file](../../doc/tutorials/input_format.md#group-input-format) to specify ranking tasks. The model used in XGBoost for ranking is the LambdaRank, this function is not yet completed. Currently, we provide pairwise rank. XGBoost supports accomplishing ranking tasks. In ranking scenario, data are often grouped and we need the [group information file](../../doc/tutorials/input_format.rst#group-input-format) to specify ranking tasks. The model used in XGBoost for ranking is the LambdaRank, this function is not yet completed. Currently, we provide pairwise rank.
### Parameters ### Parameters
The configuration setting is similar to the regression and binary classification setting, except user need to specify the objectives: The configuration setting is similar to the regression and binary classification setting, except user need to specify the objectives: