MKLDNN error for continuous image prediction

[juncaipeng]

Info：

• Paddle develop latest commit
• Ubuntu 16.04
• Python 3

Demo（Link:https://dubox.com/s/1lk60OPH4GPj-BrdZ4lSbJA Password:e8ec）：

1. Install Paddle

2. Disable MKLDNN

python test.py model/__model__ model/__params__ 0

The results are correct as follows:

1 boxes are detected for image 1
1 boxes are detected for image 2
1 boxes are detected for image 3
1 boxes are detected for image 4
1 boxes are detected for image 5
1 boxes are detected for image 6
1 boxes are detected for image 7
1 boxes are detected for image 8
1 boxes are detected for image 9
1 boxes are detected for image 10

2. Enable MKLDNN

python test.py model/__model__ model/__params__ 1

The results of image 6 and 9 are incorrect as follows:

1 boxes are detected for image 1
1 boxes are detected for image 2
1 boxes are detected for image 3
1 boxes are detected for image 4
1 boxes are detected for image 5
9 boxes are detected for image 6
1 boxes are detected for image 7
1 boxes are detected for image 8
5 boxes are detected for image 9
1 boxes are detected for image 10

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[wojtuss]

@juncaipeng ,
A fix is submitted: #31820.

[juncaipeng]

@wojtuss
The problem has been fixed. Please cherry-pick #31820 to release 2.0.

[paddle-bot-old]

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