Caffe net.predict() 输出随机结果(GoogleNet)

数据挖掘 机器学习 Python 深度学习 图像分类
2022-02-19 11:35:33

我使用了来自https://github.com/BVLC/caffe/tree/master/models/bvlc_googlenet的预训练 GoogleNet,并使用我自己的数据(约 100k 图像,101 个类)对其进行了微调。经过一天的训练,我在 top-1 分类中达到了 62%,在 top-5 分类中达到了 85%,并尝试使用这个网络来预测几张图像。

我只是按照https://github.com/BVLC/caffe/blob/master/examples/classification.ipynb的示例,

这是我的 Python 代码:

import caffe
import numpy as np


caffe_root = './caffe'


MODEL_FILE = 'caffe/models/bvlc_googlenet/deploy.prototxt'
PRETRAINED = 'caffe/models/bvlc_googlenet/bvlc_googlenet_iter_200000.caffemodel'

caffe.set_mode_gpu()

net = caffe.Classifier(MODEL_FILE, PRETRAINED,
               mean=np.load('ilsvrc_2012_mean.npy').mean(1).mean(1),
               channel_swap=(2,1,0),
               raw_scale=255,
               image_dims=(224, 224))

def caffe_predict(path):
        input_image = caffe.io.load_image(path)
        print path
        print input_image
        prediction = net.predict([input_image])


        print prediction
        print "----------"

        print 'prediction shape:', prediction[0].shape
        print 'predicted class:', prediction[0].argmax()


        proba = prediction[0][prediction[0].argmax()]
        ind = prediction[0].argsort()[-5:][::-1] # top-5 predictions


        return prediction[0].argmax(), proba, ind

在我的 deploy.prototxt 中,我只更改了最后一层来预测我的 101 个类。

layer {
  name: "loss3/classifier"
  type: "InnerProduct"
  bottom: "pool5/7x7_s1"
  top: "loss3/classifier"
  param {
    lr_mult: 1
    decay_mult: 1
  }
  param {
    lr_mult: 2
    decay_mult: 0
  }
  inner_product_param {
    num_output: 101
    weight_filler {
      type: "xavier"
    }
    bias_filler {
      type: "constant"
      value: 0
    }
  }
}
layer {
  name: "prob"
  type: "Softmax"
  bottom: "loss3/classifier"
  top: "prob"
}

这是softmax输出的分布:

[[ 0.01106235  0.00343131  0.00807581  0.01530041  0.01077161  0.0081002
   0.00989228  0.00972753  0.00429183  0.01377776  0.02028225  0.01209726
   0.01318955  0.00669979  0.00720005  0.00838189  0.00335461  0.01461464
   0.01485041  0.00543212  0.00400191  0.0084842   0.02134697  0.02500303
   0.00561895  0.00776423  0.02176422  0.00752334  0.0116104   0.01328687
   0.00517187  0.02234021  0.00727272  0.02380056  0.01210031  0.00582192
   0.00729601  0.00832637  0.00819836  0.00520551  0.00625274  0.00426603
   0.01210176  0.00571806  0.00646495  0.01589645  0.00642173  0.00805364
   0.00364388  0.01553882  0.01549598  0.01824486  0.00483241  0.01231962
   0.00545738  0.0101487   0.0040346   0.01066607  0.01328133  0.01027429
   0.01581303  0.01199994  0.00371804  0.01241552  0.00831448  0.00789811
   0.00456275  0.00504562  0.00424598  0.01309276  0.0079432   0.0140427
   0.00487625  0.02614347  0.00603372  0.00892296  0.00924052  0.00712763
   0.01101298  0.00716757  0.01019373  0.01234141  0.00905332  0.0040798
   0.00846442  0.00924353  0.00709366  0.01535406  0.00653238  0.01083806
   0.01168014  0.02076091  0.00542234  0.01246306  0.00704035  0.00529556
   0.00751443  0.00797437  0.00408798  0.00891858  0.00444583]]

这似乎就像没有意义的随机分布。

感谢您的任何帮助或提示和最好的问候,亚历克斯

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