Update type hint and unit tests of evaluator. (#110)

* update type hint and ut for evaluator

* update doc

* fix

docs/zh_cn/tutorials/evaluator.md

@@ -85,7 +85,7 @@ validation_cfg=dict(
 
 首先，自定义评测器类应继承自 `BaseEvaluator`，并应加入注册器 `EVALUATORS` (关于注册器的说明请参考[相关文档](docs\zh_cn\tutorials\registry.md))。
 
- `process()` 方法有 2 个输入参数，分别是测试数据样本`data_samples`和模型预测结果 `predictions`。我们从中分别取出样本类别标签和分类预测结果，并存放在 `self.results` 中。
+ `process()` 方法有 2 个输入参数，分别是一个批次的测试数据样本 `data_batch` 和模型预测结果 `predictions`。我们从中分别取出样本类别标签和分类预测结果，并存放在 `self.results` 中。
 
 `compute_metrics()` 方法有 1 个输入参数 `results`，里面存放了所有批次测试数据经过 `process()` 方法处理后得到的结果。从中取出样本类别标签和分类预测结果，即可计算得到分类正确率 `acc`。最终，将计算得到的评测指标以字典的形式返回。
 
@@ -111,14 +111,17 @@ class Accuracy(BaseEvaluator):
 
     default_prefix = 'ACC'
 
-    def process(self, data_samples: Dict, predictions: Dict):
+    def process(self, data_batch: Sequence[Tuple[Any, BaseDataSample]],
+                predictions: Sequence[BaseDataSample]):
         """Process one batch of data and predictions. The processed
         Results should be stored in `self.results`, which will be used
         to computed the metrics when all batches have been processed.
 
         Args:
-            data_samples (dict): The data samples from the dataset.
-            predictions (dict): The output of the model.
+            data_batch (Sequence[Tuple[Any, BaseDataSample]]): A batch of data
+                from the dataloader.
+            predictions (Sequence[BaseDataSample]): A batch of outputs from
+                the model.
         """
 
         # 取出分类预测结果和类别标签

mmengine/evaluator/base.py

@@ -5,7 +5,7 @@ import shutil
 import tempfile
 import warnings
 from abc import ABCMeta, abstractmethod
-from typing import Any, List, Optional, Union
+from typing import Any, List, Optional, Sequence, Tuple, Union
 
 import torch
 import torch.distributed as dist
@@ -62,14 +62,17 @@ class BaseEvaluator(metaclass=ABCMeta):
         self._dataset_meta = dataset_meta
 
     @abstractmethod
-    def process(self, data_samples: BaseDataSample, predictions: dict) -> None:
+    def process(self, data_batch: Sequence[Tuple[Any, BaseDataSample]],
+                predictions: Sequence[BaseDataSample]) -> None:
         """Process one batch of data samples and predictions. The processed
         results should be stored in ``self.results``, which will be used to
         compute the metrics when all batches have been processed.
 
         Args:
-            data_samples (BaseDataSample): The data samples from the dataset.
-            predictions (dict): The output of the model.
+            data_batch (Sequence[Tuple[Any, BaseDataSample]]): A batch of data
+                from the dataloader.
+            predictions (Sequence[BaseDataSample]): A batch of outputs from
+                the model.
         """
 
     @abstractmethod

mmengine/evaluator/composed_evaluator.py

 # Copyright (c) OpenMMLab. All rights reserved.
-from typing import Optional, Sequence, Union
+from typing import Any, Optional, Sequence, Tuple, Union
 
 from mmengine.data import BaseDataSample
 from .base import BaseEvaluator
@@ -32,16 +32,19 @@ class ComposedEvaluator:
         for evaluator in self.evaluators:
             evaluator.dataset_meta = dataset_meta
 
-    def process(self, data_samples: BaseDataSample, predictions: dict):
+    def process(self, data_batch: Sequence[Tuple[Any, BaseDataSample]],
+                predictions: Sequence[BaseDataSample]):
         """Invoke process method of each wrapped evaluator.
 
         Args:
-            data_samples (BaseDataSample): The data samples from the dataset.
-            predictions (dict): The output of the model.
+            data_batch (Sequence[Tuple[Any, BaseDataSample]]): A batch of data
+                from the dataloader.
+            predictions (Sequence[BaseDataSample]): A batch of outputs from
+                the model.
         """
 
         for evalutor in self.evaluators:
-            evalutor.process(data_samples, predictions)
+            evalutor.process(data_batch, predictions)
 
     def evaluate(self, size: int) -> dict:
         """Invoke evaluate method of each wrapped evaluator and collect the

tests/test_evaluator/test_base_evaluator.py

@@ -5,6 +5,7 @@ from unittest import TestCase
 
 import numpy as np
 
+from mmengine.data import BaseDataSample
 from mmengine.evaluator import BaseEvaluator, build_evaluator
 from mmengine.registry import EVALUATORS
 
@@ -36,17 +37,20 @@ class ToyEvaluator(BaseEvaluator):
         super().__init__(collect_device=collect_device, prefix=prefix)
         self.dummy_metrics = dummy_metrics
 
-    def process(self, data_samples, predictions):
-        result = {'pred': predictions['pred'], 'label': data_samples['label']}
-        self.results.append(result)
+    def process(self, data_batch, predictions):
+        results = [{
+            'pred': pred.pred,
+            'label': data[1].label
+        } for pred, data in zip(predictions, data_batch)]
+        self.results.extend(results)
 
     def compute_metrics(self, results: List):
         if self.dummy_metrics is not None:
             assert isinstance(self.dummy_metrics, dict)
             return self.dummy_metrics.copy()
 
-        pred = np.concatenate([result['pred'] for result in results])
-        label = np.concatenate([result['label'] for result in results])
+        pred = np.array([result['pred'] for result in results])
+        label = np.array([result['label'] for result in results])
         acc = (pred == label).sum() / pred.size
 
         metrics = {
@@ -74,9 +78,11 @@ def generate_test_results(size, batch_size, pred, label):
     bs_residual = size % batch_size
     for i in range(num_batch):
         bs = bs_residual if i == num_batch - 1 else batch_size
-        data_samples = {'label': np.full(bs, label)}
-        predictions = {'pred': np.full(bs, pred)}
-        yield (data_samples, predictions)
+        data_batch = [(np.zeros(
+            (3, 10, 10)), BaseDataSample(data={'label': label}))
+                      for _ in range(bs)]
+        predictions = [BaseDataSample(data={'pred': pred}) for _ in range(bs)]
+        yield (data_batch, predictions)
 
 
 class TestBaseEvaluator(TestCase):