Reimplement lambdamart ndcg.

* Simplify the implementation for both CPU and GPU.

Fix JSON IO.

Check labels.

Put idx into cache.

Optimize.

File tag.

Weights.

Trivial tests.

Compatibility.

Lint.

Fix swap.

Device weight.

tidy.

Easier to read R failure.

enum.

Fix global configuration.

Tidy.

msvc omp.

dask.

Remove ndcg specific parameter.  Drop label type for smaller PR.

Fix rebase.

Fixes.

Don't mess with includes.

Fixes.

Format.

Use omp util.

Restore some old code.

Revert.

Port changes from the work on quantile loss.

python binding.

param.

Cleanup.

conditional parallel.

types.

Move doc.

fix.

need metric rewrite.

rename ctx.

extract.

Work on metric.

Metric

Init estimation.

extract tests, compute ties.

cleanup.

notes.

extract optional weights.

init.

cleanup.

old metric format.

note.

ndcg cache.

nested.

debug.

fix.

log2.

Begin CUDA work.

temp.

Extract sort and latest cuda.

truncation.

dcg.

dispatch.

try different gain type.

start looking into ub.

note.

consider writing a doc.

check exp gain.

Reimplement lambdamart ndcg.

* Simplify the implementation for both CPU and GPU.

Fix JSON IO.

Check labels.

Put idx into cache.

Optimize.

File tag.

Weights.

Trivial tests.

Compatibility.

Lint.

Fix swap.

Device weight.

tidy.

Easier to read R failure.

enum.

Fix global configuration.

Tidy.

msvc omp.

dask.

Remove ndcg specific parameter.  Drop label type for smaller PR.

Fix rebase.

Fixes.

Don't mess with includes.

Fixes.

Format.

Use omp util.

Restore some old code.

Revert.

Port changes from the work on quantile loss.

python binding.

param.

Cleanup.

conditional parallel.

types.

Move doc.

fix.

need metric rewrite.

rename ctx.

extract.

Work on metric.

Metric

Init estimation.

extract tests, compute ties.

cleanup.

notes.

extract optional weights.

init.

cleanup.

old metric format.

note.

ndcg cache.

nested.

debug.

fix.

log2.

Begin CUDA work.

temp.

Extract sort and latest cuda.

truncation.

dcg.

dispatch.

try different gain type.

start looking into ub.

note.

consider writing a doc.

check exp gain.

Start looking into unbiased.

lambda.

Extract the ndcg cache.

header.

cleanup namespace.

small check.

namespace.

init with param.

gain.

extract.

groups.

Cleanup.

disable.

debug.

remove.

Revert "remove."

This reverts commit ea025f9.

sigmoid.

cleanup.

metric name.

check scores.

note.

check map.

extract utilities.

avoid inline.

fix.

header.

extract more.

note.

note.

note.

start working on map.

fix.

continue map.

map.

matrix.

Remove map.

note.

format.

move check.

cleanup.

use cached discount, use double.

cleanup.

Add position to the Python interface.

pass it into lambda.

Full ratio.

rank.

comment.

some work on GPU.

compile.

move cache initialization.

descending.

Fix arg sort.

basic ndcg score.

metric weight.

config.

extract.

pass position again.

Define a metric decorator.

position.

decorate metric..

return.

note.

irrelevant docs.

fix weights.

header.

Share the bias.

Use position

check info.

use cache for param.

note.

prepare to work on deterministic gpu.

rounding.

Extract op.

cleanup.

Use it.

check label.

ditch launchn.

rounding.

Move rounding into cache.

fix check label.

GPU fixes.

Irrelevant doc.

try to avoid inf.

mad.

Work on metric cache.

Cleanup sort.

use cache.

cache others.

revert.

add test for metric.

fixes.

msg.

note.

remove reduce by key.

comments.

check position.

stream.

min.

small cleanup.

use atomic for now.

fill.

no inline.

norm.

remove op.

start gpu.

cleanup.

use gpu for update.

segmented reduce.

revert.

comments.

comments.

fix.

comments.

fix bounds.

comments.

cache.

pointer.

fixes.

no spark.

revert.

Cleanup.

cleanup.

work on gain type.

fix.

notes.

make metric name.

remove.

revert.

revert.

comment.

revert.

Move back into rank metric.

Set name in objective.

fix.

Don't configure.

note.

merge tests.

accept empty group.

fixes.

float.

revert and fix.

not mutable.

prototype for cache.

extract.

convert to DMatrix.

cache.

Extract the cache.

Port changes.

fix & cleanup.

cleanup.

cleanup.

Rename.

restore.

remove.

header.

revert.

rename.

rename.

doc.

cleanup.

doc.

cleanup.

tests.

tests.

split up.

jvm parameters.

doc.

Fix.

Use cache in cox.

Revert "Use cache in cox."

This reverts commit e1cec37.

Remove pairwise.

iwyu.

rename.

Move.

Merge.

ranking utils.

Fixes.

rename.

Comments.

todos.

Small cleanup.

doc.

Start working on demo.

move some code here.

rename.

Update doc.

Update doc.

Work on demo.

work on demo.

demo.

Demo.

Specify the max rel degree.

remove position.

Fix.

Work on demo.

demo.

Using only one fold.

cache.

demo.

schema.

comments.

Lint.

fix test.

automake.

macos.

schema.

test.

schema.

lint.

fix tests.

Implement MAP and pair sampling.

revert sorting.

Work on ranknet.

remove.

Don't upgrade cost if larger than.

Extract GPU make pairs.

error message.

Remove.

Cleanup some gpu tests.

Move.

Move NDCG test.

fix weights.

Move rest of the tests.

Remove.

Work on tests.

fixes.

Cleanup.

header.

cleanup.

Update document.

update document.

fix build.

cpplint.

rename.

Fixes and cleanup.

Cleanup tests.

lint.

fix tests.

debug macos non-openmp checks.

macos.

fix ndcg test.

Ensure number of threads is smaller than the number of inputs.

fix.

Debug macos.

fixes.

Add weight normalization.

Note on reproducible result.

Don't normalize if it's binary.

old ctk.

Use old objective.

Update doc.

Convert pyspark tests.

black.

Fix rebase.

Fix rebase.

Start looking into CV.

Hacky score function.

extract parsing.

Cleanup and tests.

Lint & note.

test check.

Update document.

Update tests & doc.

Support custom metric as well.

c++-17.

cleanup old metrics.

rename.

Fixes.

Fix cxx test.

test cudf.

start converting tests.

pylint.

fix data load.

Cleanup the tests.

Parameter tests.

isort.

Fix test.

Specify src path for isort.

17 goodies.

Fix rebase.

Start working on ranking cache tests.

Extract CPU impl.

test debiasing.

use index.

ranking cache.

comment.

some work on debiasing.

save the estimated bias.

normalize by default.

GPU norm.

fix gpu unbiased.

cleanup.

cleanup.

R-package/src/Makevars.in

@@ -32,7 +32,7 @@ OBJECTS= \
     $(PKGROOT)/src/objective/objective.o \
     $(PKGROOT)/src/objective/regression_obj.o \
     $(PKGROOT)/src/objective/multiclass_obj.o \
-    $(PKGROOT)/src/objective/rank_obj.o \
+    $(PKGROOT)/src/objective/lambdarank_obj.o \
     $(PKGROOT)/src/objective/hinge.o \
     $(PKGROOT)/src/objective/aft_obj.o \
     $(PKGROOT)/src/objective/adaptive.o \

R-package/src/Makevars.win

@@ -32,7 +32,7 @@ OBJECTS= \
     $(PKGROOT)/src/objective/objective.o \
     $(PKGROOT)/src/objective/regression_obj.o \
     $(PKGROOT)/src/objective/multiclass_obj.o \
-    $(PKGROOT)/src/objective/rank_obj.o \
+    $(PKGROOT)/src/objective/lambdarank_obj.o \
     $(PKGROOT)/src/objective/hinge.o \
     $(PKGROOT)/src/objective/aft_obj.o \
     $(PKGROOT)/src/objective/adaptive.o \