jina.executors.evaluators

class jina.executors.evaluators.BaseEvaluator(*args, **kwargs)[source]

Bases: jina.executors.BaseExecutor

A BaseEvaluator is used to evaluate different messages coming from any kind of executor

Constructor.

metric = ''

Get the name of the evaluation metric

post_init()[source]

Initialize running stats.

evaluate(actual, desired, *args, **kwargs)[source]

Evaluates difference between param:actual and param:desired, needs to be implemented in subclass.

Return type

float

property mean

Get the running mean.

Return type

float

property std

Get the running standard variance.

Return type

float

property variance

Get the running variance.

Return type

float

class jina.executors.evaluators.FileBasedEvaluator(routes=None, resolve_all=True, *args, **kwargs)[source]

Bases: jina.executors.compound.CompoundExecutor

A Frequently used pattern for combining A BinaryPbIndexer and BaseEvaluator.

It will be equipped with predefined requests.on behaviors:

  • At evaluation time(query or index)
      1. Checks for the incoming document, gets its value from the BinaryPbIndexer and fills the `groundtruth of the request

      1. Filter the documents that do not have a corresponding groundtruth

      1. The BaseEvaluator works as if the groundtruth had been provided by the client as it comes in the request.

Warning

The documents that are not found to have an indexed groundtruth are removed from the request so that the Evaluator only works with documents which have groundtruth.

One can use the FileBasedEvaluator via

!FileBasedEvaluator
components:
  - !BinaryPbIndexer
    with:
      index_filename: ground_truth.gz
    metas:
      name: groundtruth_index  # a customized name
      workspace: ${{TEST_WORKDIR}}
  - !BaseEvaluator

Without defining any requests.on logic. When load from this YAML, it will be auto equipped with

on:
  [SearchRequest, IndexRequest]:
    - !LoadGroundTruthDriver
      with:
        executor: BaseKVIndexer
    - !BaseEvaluateDriver
      with:
        executor: BaseEvaluator
  ControlRequest:
    - !ControlReqDriver {}

Create a new CompoundExecutor object

Parameters
  • routes (Optional[Dict[str, Dict]]) –

    a map of function routes. The key is the function name, the value is a tuple of two pieces, where the first element is the name of the referred component (metas.name) and the second element is the name of the referred function.

    See also

    add_route()

  • resolve_all (bool) – universally add *_all() to all functions that have the identical name

Example:

We have two dummy executors as follows:

class dummyA(BaseExecutor):
    def say(self):
        return 'a'

    def sayA(self):
        print('A: im A')


class dummyB(BaseExecutor):
    def say(self):
        return 'b'

    def sayB(self):
        print('B: im B')

and we create a CompoundExecutor consisting of these two via

da, db = dummyA(), dummyB()
ce = CompoundExecutor()
ce.components = lambda: [da, db]

Now the new executor ce have two new methods, i.e ce.sayA() and ce.sayB(). They point to the original dummyA.sayA() and dummyB.sayB() respectively. One can say ce has inherited these two methods.

The interesting part is say(), as this function name is shared between dummyA and dummyB. It requires some resolution. When resolve_all=True, then a new function say_all() is add to ce. ce.say_all works as if you call dummyA.sayA() and dummyB.sayB() in a row. This makes sense in some cases such as training, saving. In other cases, it may require a more sophisticated resolution, where one can use add_route() to achieve that. For example,

ce.add_route('say', db.name, 'say')
assert b.say() == 'b'

Such resolution is what we call routes here, and it can be specified in advance with the arguments routes in __init__(), or using YAML.

!CompoundExecutor
components: ...
with:
  resolve_all: true
  routes:
    say:
    - dummyB-e3acc910
    - say

Warning

When setting inner executors in components the workspace configuration will not be used and will be overriden by a workspace extracted considering the name of the CompoundExecutor, the name of each internal Component and the pea_id