使用cfgs_resnet50_dota_v4和cfgs_resnet50_dota_v1失函数一直震荡，

[zsh1234567]

学长你好，请问一下，我用DOTA1.0数据集，配置文件用cfgs_resnet50_dota_v4和cfgs_resnet50_dota_v1，损失函数减小到一定程度后，一直在0.2-1.2震荡。训练50万次后。map如下:
This is your result for task 1:

mAP: 0.23566566257635685
ap of each class: plane:0.7932061577172662, baseball-diamond:0.1312957338658761, bridge:0.1573459176315261, ground-track-field:0.12121038920876634, small-vehicle:0.40128576370292635, large-vehicle:0.022644009706195248, ship:0.1586747601553599, tennis-court:0.8067936180062999, basketball-court:0.11268627691278782, storage-tank:0.548819002806353, soccer-ball-field:0.0028656588723735567, roundabout:0.07246264775533927, harbor:0.08824166994332554, swimming-pool:0.11577374370476157, helicopter:0.0016795886561954384

请问一下为什么会出现这种情况呢