使用keras部署深度学习模型（rest api）

参考 building-a-simple-keras-deep-learning-rest-api

文章中比较重要的代码是2个地方
1. 模型加载
这里貌似是通过网络下载的，所以可能加载比较慢

def load_model():
    # load the pre-trained Keras model (here we are using a model
    # pre-trained on ImageNet and provided by Keras, but you can
    # substitute in your own networks just as easily)
    global model
    model = ResNet50(weights="imagenet")

2.模型调用
通过post请求上传图片。
调用模型就一行代码

model.predict(image)

if flask.request.method == "POST":
        if flask.request.files.get("image"):
            # read the image in PIL format
            image = flask.request.files["image"].read()
            image = Image.open(io.BytesIO(image))

            # preprocess the image and prepare it for classification
            image = prepare_image(image, target=(224, 224))

            # classify the input image and then initialize the list
            # of predictions to return to the client
            preds = model.predict(image)
            results = imagenet_utils.decode_predictions(preds)
            data["predictions"] = []

            # loop over the results and add them to the list of
            # returned predictions
            for (imagenetID, label, prob) in results[0]:
                r = {"label": label, "probability": float(prob)}
                data["predictions"].append(r)

            # indicate that the request was a success
            data["success"] = True

但我在实际操作时，就遇到了问题。
首先，不知道keras版本是多少。还好到文章中给出的github链接找到了依赖：

Keras 2.2.4
TF 1.13.1

其次，跑起来报错：

 Tensor is not an element of this graph

还是通过文章中给出的github链接当中，找到了 解决办法，看来是并发导致的问题。
最后的代码改动点在这里，注意加粗部分：

def my_load_model():
# load the pre-trained Keras model (here we are using a model
# pre-trained on ImageNet and provided by Keras, but you can
# substitute in your own networks just as easily)
global model
model = ResNet50(weights="imagenet")
global graph
graph = tf.get_default_graph()

def predict():
# initialize the data dictionary that will be returned from the
# view
data = {"success": False}
global graph
with graph.as_default():
# ensure an image was properly uploaded to our endpoint
if flask.request.method == "POST":