update metric

ppcls/metric/metrics.py

+# copyright (c) 2021 PaddlePaddle Authors. All Rights Reserve.
+#
+# 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.
+
+import numpy as np
+import paddle
+import paddle.nn as nn
+
+
+# TODO: fix the format
+class Topk(nn.Layer):
+    def __init__(self, topk=(1, 5)):
+        super().__init__()
+        assert isinstance(topk, (int, list, tuple))
+        if isinstance(topk, int):
+            topk = [topk]
+        self.topk = topk
+
+    def forward(self, x, label):
+        if isinstance(x, dict):
+            x = x["logits"]
+
+        metric_dict = dict()
+        for k in self.topk:
+            metric_dict["top{}".format(k)] = paddle.metric.accuracy(
+                x, label, k=k)
+        return metric_dict
+
+
+class mAP(nn.Layer):
+    def __init__(self, max_rank=50):
+        super().__init__()
+        self.max_rank = max_rank
+
+    def forward(self, similarities_matrix, query_img_id, gallery_img_id):
+        metric_dict = dict()
+        num_q, num_g = similarities_matrix.shape
+        q_pids = query_img_id.numpy().reshape((query_img_id.shape[0]))
+        g_pids = gallery_img_id.numpy().reshape((gallery_img_id.shape[0]))
+        if num_g < self.max_rank:
+            self.max_rank = num_g
+            print('Note: number of gallery samples is quite small, got {}'.
+                  format(num_g))
+        indices = paddle.argsort(
+            similarities_matrix, axis=1, descending=True).numpy()
+        _, all_AP, _ = get_metrics(indices, num_q, num_g, q_pids, g_pids,
+                                   self.max_rank)
+
+        mAP = np.mean(all_AP)
+        metric_dict["mAP"] = mAP
+        return metric_dict
+
+
+class mINP(nn.Layer):
+    def __init__(self, max_rank=50):
+        super().__init__()
+        self.max_rank = max_rank
+
+    def forward(self, similarities_matrix, query_img_id, gallery_img_id):
+        metric_dict = dict()
+        num_q, num_g = similarities_matrix.shape
+        q_pids = query_img_id.numpy().reshape((query_img_id.shape[0]))
+        g_pids = gallery_img_id.numpy().reshape((gallery_img_id.shape[0]))
+        if num_g < self.max_rank:
+            max_rank = num_g
+            print('Note: number of gallery samples is quite small, got {}'.
+                  format(num_g))
+        indices = paddle.argsort(
+            similarities_matrix, axis=1, descending=True).numpy()
+        _, _, all_INP = get_metrics(indices, num_q, num_g, q_pids, g_pids,
+                                    self.max_rank)
+
+        mINP = np.mean(all_INP)
+        metric_dict["mINP"] = mINP
+        return metric_dict
+
+
+class Recallk(nn.Layer):
+    def __init__(self, max_rank=50, topk=(1, 5)):
+        super().__init__()
+        self.max_rank = max_rank
+        assert isinstance(topk, (int, list))
+        if isinstance(topk, int):
+            topk = [topk]
+        self.topk = topk
+
+    def forward(self, similarities_matrix, query_img_id, gallery_img_id):
+        metric_dict = dict()
+        num_q, num_g = similarities_matrix.shape
+        q_pids = query_img_id.numpy().reshape((query_img_id.shape[0]))
+        g_pids = gallery_img_id.numpy().reshape((gallery_img_id.shape[0]))
+        if num_g < self.max_rank:
+            max_rank = num_g
+            print('Note: number of gallery samples is quite small, got {}'.
+                  format(num_g))
+        indices = paddle.argsort(
+            similarities_matrix, axis=1, descending=True).numpy()
+        all_cmc, _, _ = get_metrics(indices, num_q, num_g, q_pids, g_pids,
+                                    self.max_rank)
+
+        for k in self.topk:
+            metric_dict["recall{}".format(k)] = all_cmc[k - 1]
+        return metric_dict
+
+
+def get_metrics(indices, num_q, num_g, q_pids, g_pids, max_rank=50):
+    all_cmc = []
+    all_AP = []
+    all_INP = []
+    num_valid_q = 0
+    matches = (g_pids[indices] == q_pids[:, np.newaxis]).astype(np.int32)
+    for q_idx in range(num_q):
+        q_pid = q_pids[q_idx]
+        order = indices[q_idx]
+        remove = g_pids[order] == q_pid
+        keep = np.invert(remove)
+        raw_cmc = matches[q_idx][keep]
+        if not np.any(raw_cmc):
+            continue
+        cmc = raw_cmc.cumsum()
+        pos_idx = np.where(raw_cmc == 1)
+        max_pos_idx = np.max(pos_idx)
+        inp = cmc[max_pos_idx] / (max_pos_idx + 1.0)
+        all_INP.append(inp)
+        cmc[cmc > 1] = 1
+
+        all_cmc.append(cmc[:max_rank])
+        num_valid_q += 1.
+
+        num_rel = raw_cmc.sum()
+        tmp_cmc = raw_cmc.cumsum()
+        tmp_cmc = [x / (i + 1.) for i, x in enumerate(tmp_cmc)]
+        tmp_cmc = np.asarray(tmp_cmc) * raw_cmc
+        AP = tmp_cmc.sum() / num_rel
+        all_AP.append(AP)
+    assert num_valid_q > 0, 'Error: all query identities do not appear in gallery'
+
+    all_cmc = np.asarray(all_cmc).astype(np.float32)
+    all_cmc = all_cmc.sum(0) / num_valid_q
+
+    return all_cmc, all_AP, all_INP