一个 Tensorflow 会话中的多个图

Question

我目前正在尝试实现一个代码，让我的无人机使用 tensorflow 在室内导航。我需要在一个会话中运行两个模型。

一个用于主导航——这是一个重新训练的 Inception V3 模型，负责对走廊图像进行分类并执行向前、向左或向右移动的决策——第二个是一个对象跟踪模型，它将跟踪对象并计算到相机的相对距离。

我不知道如何在一个会话中使用多个图表，所以我尝试在循环内创建一个单独的会话，这会产生很大的开销并导致我的脚本运行为 0 FPS。

def inception_model():
# Graph for the InceptionV3 Model
graph = load_graph('inception_v3_frozen/inception_v3_2016_08_28_frozen.pb')

with tf.Session(graph = graph) as sess:
    while camera.isOpened():
        ok, img = camera.read()
        cv.imwrite("frame_temp.jpeg", img)
        t = read_tensor_from_image('frame_temp.jpeg')

        input_layer = "input"
        output_layer = "InceptionV3/Predictions/Reshape_1"

        input_name = "import/" + input_layer
        output_name = "import/" + output_layer

        input_operation = graph.get_operation_by_name(input_name)
        output_operation = graph.get_operation_by_name(output_name)

        results = sess.run(output_operation.outputs[0], {
            input_operation.outputs[0] : t
        })
        results = np.squeeze(results)

        top_k = results.argsort()[-5:][::-1]
        for i in top_k:
            print(labels[i], results[i])

# inception_model()
with tf.Session(graph = object_detection_graph) as sess:
    while camera.isOpened():
        ok, img = camera.read()
        cv.imwrite("frame_temp.jpeg", img)
        img = np.array(img)
        rows = img.shape[0]
        cols = img.shape[1]

        inp = cv.resize(img, (299, 299))

        # inception_model()
        # # Graph for the InceptionV3 Model
        # graph = load_graph('inception_v3_frozen/inception_v3_2016_08_28_frozen.pb')

        # t = read_tensor_from_image('frame_temp.jpeg')

        # input_layer = "input"
        # output_layer = "InceptionV3/Predictions/Reshape_1"

        # input_name = "import/" + input_layer
        # output_name = "import/" + output_layer

        # input_operation = graph.get_operation_by_name(input_name)
        # output_operation = graph.get_operation_by_name(output_name)

        # with tf.Session(graph = graph) as sess:
        #     results = sess.run(output_operation.outputs[0], {
        #         input_operation.outputs[0] : t
        #     })
        # results = np.squeeze(results)

        # top_k = results.argsort()[-5:][::-1]
        # for i in top_k:
        #     print(labels[i], results[i])


        inp = inp[:, :, [2, 1, 0]]  # BGR2RGB


        # Run the model
        out = sess.run([object_detection_graph.get_tensor_by_name('num_detections:0'),
                        object_detection_graph.get_tensor_by_name('detection_scores:0'),
                        object_detection_graph.get_tensor_by_name('detection_boxes:0'),
                        object_detection_graph.get_tensor_by_name('detection_classes:0')],
                    feed_dict={'image_tensor:0': inp.reshape(1, inp.shape[0], inp.shape[1], 3)})

Answer 1

您不必在每次迭代时都创建新会话。创建一次并继续调用它们的运行方法。 Tensorflow 支持多个活动会话。

另一种选择是拥有一个 Graph 对象和一个 Session。该图可以包含您的两个模型作为断开连接的子图。当您在 Session.run() 中请求张量时，Tensorflow 将运行仅计算您请求的张量所必需的。所以，另一个子图不会运行（尽管它会花费一些时间，可能非常小，时间来 p运行e 它）

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