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mean_reciprocal_rank.py
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mean_reciprocal_rank.py
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# Copyright The PyTorch Lightning team.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from torch import Tensor, tensor
from torchmetrics.functional.retrieval.reciprocal_rank import retrieval_reciprocal_rank
from torchmetrics.retrieval.retrieval_metric import RetrievalMetric
class RetrievalMRR(RetrievalMetric):
"""
Computes `Mean Reciprocal Rank
<https://en.wikipedia.org/wiki/Mean_reciprocal_rank>`__.
Works with binary target data. Accepts float predictions from a model output.
Forward accepts
- ``preds`` (float tensor): ``(N, ...)``
- ``target`` (long or bool tensor): ``(N, ...)``
- ``indexes`` (long tensor): ``(N, ...)``
``indexes``, ``preds`` and ``target`` must have the same dimension.
``indexes`` indicate to which query a prediction belongs.
Predictions will be first grouped by ``indexes`` and then `MRR` will be computed as the mean
of the `Reciprocal Rank` over each query.
Args:
empty_target_action:
Specify what to do with queries that do not have at least a positive ``target``. Choose from:
- ``'neg'``: those queries count as ``0.0`` (default)
- ``'pos'``: those queries count as ``1.0``
- ``'skip'``: skip those queries; if all queries are skipped, ``0.0`` is returned
- ``'error'``: raise a ``ValueError``
compute_on_step:
Forward only calls ``update()`` and return None if this is set to False. default: True
dist_sync_on_step:
Synchronize metric state across processes at each ``forward()``
before returning the value at the step. default: False
process_group:
Specify the process group on which synchronization is called. default: None (which selects
the entire world)
dist_sync_fn:
Callback that performs the allgather operation on the metric state. When `None`, DDP
will be used to perform the allgather. default: None
Example:
>>> from torchmetrics import RetrievalMRR
>>> indexes = tensor([0, 0, 0, 1, 1, 1, 1])
>>> preds = tensor([0.2, 0.3, 0.5, 0.1, 0.3, 0.5, 0.2])
>>> target = tensor([False, False, True, False, True, False, True])
>>> mrr = RetrievalMRR()
>>> mrr(preds, target, indexes=indexes)
tensor(0.7500)
"""
def _metric(self, preds: Tensor, target: Tensor) -> Tensor:
return retrieval_reciprocal_rank(preds, target)