nasbench201 api bug

[gxiaotian]

Changing the order of arch dictionary causes query_nb201_trial_stats returns nothing.

Environment:

• NNI version: v1.7
• Client OS: Windows10 WSL
• Python version: 3.7

code:

arch = {"0_1": "conv_3x3", "0_2": "none", "1_2": "avg_pool_3x3", "0_3": "none", "1_3": "none", "2_3": "conv_3x3"}
print(len([t for t in query_nb201_trial_stats(arch, 200, 'cifar100')]))
arch = {"0_1": "conv_3x3", "0_2": "none", "0_3": "none", "1_2": "avg_pool_3x3", "1_3": "none", "2_3": "conv_3x3"}
print(len([t for t in query_nb201_trial_stats(arch, 200, 'cifar100')]))

result:

3
0