Fix import path of network morphism example (#3333)

* Fix import path

* Fix conflicted version

examples/trials/network_morphism/cifar10/cifar10_keras.py

@@ -28,7 +28,7 @@ from keras.utils import multi_gpu_model, to_categorical
 import keras.backend.tensorflow_backend as KTF
 
 import nni
-from nni.networkmorphism_tuner.graph import json_to_graph
+from nni.algorithms.hpo.networkmorphism_tuner.graph import json_to_graph
 
 # set the logger format
 log_format = "%(asctime)s %(message)s"

examples/trials/network_morphism/cifar10/cifar10_pytorch.py

@@ -20,7 +20,7 @@ import logging
 import sys
 
 import nni
-from nni.networkmorphism_tuner.graph import json_to_graph
+from nni.algorithms.hpo.networkmorphism_tuner.graph import json_to_graph
 
 import torch
 import torch.nn as nn

examples/trials/network_morphism/requirements.txt

-numpy==1.19.3
+numpy==1.18.5
 tensorflow==1.15.4
 torchvision==0.2.1
 Keras==2.3.1