使用SageMaker模型预测批量图像

时间：2018-02-06 10:19:42

标签： python tensorflow-serving tensorflow-estimator amazon-sagemaker

感谢您提前帮助解决此问题。 我在Sagemaker上训练了一个模型。这是一个TensorFlow估算器，它将图像作为输入，使用InceptionV3计算高级功能（即瓶颈），然后使用密集层来预测新类。

它有点起作用：我可以训练它，服务它，并预测新的图像一个人。

现在，我想在一次独特的HTTP调用/ predict（）调用中一次预测整批图像。怎么样？

我是这样做的：

from IPython.display import Image
import numpy as np
from keras.preprocessing import image

estimator = TensorFlow(entry_point=..., ...)
estimator.fit(train_data_location)
predictor = estimator.deploy(initial_instance_count=1,
                         instance_type='ml.m4.xlarge')

image_list = [
    'e9bfa679-31bb-464e-9d9f-3bdb0ef9c121.jpeg',  # 131
    'b27880e1-6de8-43cf-a684-bb02aef1e44b.jpeg',  # 170
]
directory = '/path/to/dir/'
images = np.empty((len(image_list), 299, 299, 3), dtype=np.float32)
# for filename in image_list:
for i,filename in enumerate(image_list):
    path = os.path.join(directory, filename)
    Image(path)
    img = image.load_img(path, target_size=(299, 299))
    x = image.img_to_array(img)
    images[i] = x

print(images.shape)
# to_send = images[-1]  # works for a unique image
to_send = images  # doesn't work for a batch of images
# some other attempts that did not work
# to_send = images.tolist()
# to_send = [images[0].tolist(), images[1].tolist()]
print(np.shape(to_send))

predict_response = predictor.predict(to_send)
print('The model predicted the following classes: \n{}'.format(
    predict_response['outputs']['classes']['int64Val']))

这会激发以下结果：

  

（2,299,299,3）

     

（2,299,299,3）＃注意我发送的形状。那么为什么它会在下面的日志中抱怨形状[1,2,299,299,3]？

     

ModelError：发生错误   （ModelError）调用InvokeEndpoint操作时：Received   带有消息“”的模型的服务器错误（500）。看到   https://eu-west-1.console.aws.amazon.com/cloudwatch/home?region=eu-west-1#logEventViewer:group=/aws/sagemaker/Endpoints/sagemaker-tensorflow-py2-cpu-2018-02-05-16-48-38-496   在帐户047562184710获取更多信息

以下是来自AWS的日志：

# [2018-02-06 09:29:20,937] ERROR in serving: AbortionError(code=StatusCode.INVALID_ARGUMENT, details="input must be 4-dimensional[1,2,299,299,3]
# #011 [[Node: ResizeBilinear = ResizeBilinear[T=DT_FLOAT, _output_shapes=[[1,299,299,3]], align_corners=false, _device="/job:localhost/replica:0/task:0/device:CPU:0"](ExpandDims, ResizeBilinear/size)]]")
# Traceback (most recent call last):
# File "/opt/amazon/lib/python2.7/site-packages/container_support/serving.py", line 161, in _invoke
# self.transformer.transform(content, input_content_type, requested_output_content_type)
# File "/opt/amazon/lib/python2.7/site-packages/tf_container/serve.py", line 255, in transform
# return self.transform_fn(data, content_type, accepts), accepts
# File "/opt/amazon/lib/python2.7/site-packages/tf_container/serve.py", line 180, in f
# prediction = self.predict_fn(input)
# File "/opt/amazon/lib/python2.7/site-packages/tf_container/serve.py", line 195, in predict_fn
# return self.proxy_client.request(data)
# File "/opt/amazon/lib/python2.7/site-packages/tf_container/proxy_client.py", line 51, in request
# return request_fn(data)
# File "/opt/amazon/lib/python2.7/site-packages/tf_container/proxy_client.py", line 79, in predict
# result = stub.Predict(request, self.request_timeout)
# File "/usr/local/lib/python2.7/dist-packages/grpc/beta/_client_adaptations.py", line 310, in __call__
# self._request_serializer, self._response_deserializer)
# File "/usr/local/lib/python2.7/dist-packages/grpc/beta/_client_adaptations.py", line 196, in _blocking_unary_unary
# raise _abortion_error(rpc_error_call)
# AbortionError: AbortionError(code=StatusCode.INVALID_ARGUMENT, details="input must be 4-dimensional[1,2,299,299,3]
# #011 [[Node: ResizeBilinear = ResizeBilinear[T=DT_FLOAT, _output_shapes=[[1,299,299,3]], align_corners=false, _device="/job:localhost/replica:0/task:0/device:CPU:0"](ExpandDims, ResizeBilinear/size)]]")
# 2018-02-06 09:29:20,937 ERROR - model server - AbortionError(code=StatusCode.INVALID_ARGUMENT, details="input must be 4-dimensional[1,2,299,299,3]
# #011 [[Node: ResizeBilinear = ResizeBilinear[T=DT_FLOAT, _output_shapes=[[1,299,299,3]], align_corners=false, _device="/job:localhost/replica:0/task:0/device:CPU:0"](ExpandDims, ResizeBilinear/size)]]")
# Traceback (most recent call last):
# File "/opt/amazon/lib/python2.7/site-packages/container_support/serving.py", line 161, in _invoke
# self.transformer.transform(content, input_content_type, requested_output_content_type)
# File "/opt/amazon/lib/python2.7/site-packages/tf_container/serve.py", line 255, in transform
# return self.transform_fn(data, content_type, accepts), accepts
# File "/opt/amazon/lib/python2.7/site-packages/tf_container/serve.py", line 180, in f
# prediction = self.predict_fn(input)
# File "/opt/amazon/lib/python2.7/site-packages/tf_container/serve.py", line 195, in predict_fn
# return self.proxy_client.request(data)
# File "/opt/amazon/lib/python2.7/site-packages/tf_container/proxy_client.py", line 51, in request
# return request_fn(data)
# File "/opt/amazon/lib/python2.7/site-packages/tf_container/proxy_client.py", line 79, in predict
# result = stub.Predict(request, self.request_timeout)
# File "/usr/local/lib/python2.7/dist-packages/grpc/beta/_client_adaptations.py", line 310, in __call__
# self._request_serializer, self._response_deserializer)
# File "/usr/local/lib/python2.7/dist-packages/grpc/beta/_client_adaptations.py", line 196, in _blocking_unary_unary
# raise _abortion_error(rpc_error_call)
# AbortionError: AbortionError(code=StatusCode.INVALID_ARGUMENT, details="input must be 4-dimensional[1,2,299,299,3]
# #011 [[Node: ResizeBilinear = ResizeBilinear[T=DT_FLOAT, _output_shapes=[[1,299,299,3]], align_corners=false, _device="/job:localhost/replica:0/task:0/device:CPU:0"](ExpandDims, ResizeBilinear/size)]]")
# [2018-02-06 09:29:20,956] ERROR in serving: AbortionError(code=StatusCode.INVALID_ARGUMENT, details="input must be 4-dimensional[1,2,299,299,3]
# #011 [[Node: ResizeBilinear = ResizeBilinear[T=DT_FLOAT, _output_shapes=[[1,299,299,3]], align_corners=false, _device="/job:localhost/replica:0/task:0/device:CPU:0"](ExpandDims, ResizeBilinear/size)]]")
# 2018-02-06 09:29:20,956 ERROR - model server - AbortionError(code=StatusCode.INVALID_ARGUMENT, details="input must be 4-dimensional[1,2,299,299,3]
# #011 [[Node: ResizeBilinear = ResizeBilinear[T=DT_FLOAT, _output_shapes=[[1,299,299,3]], align_corners=false, _device="/job:localhost/replica:0/task:0/device:CPU:0"](ExpandDims, ResizeBilinear/size)]]")
# 10.32.0.1 - - [06/Feb/2018:09:29:20 +0000] "POST /invocations HTTP/1.1" 500 0 "-" "AHC/2.0"

顺便说一句，如果我用PIL而不是Keras加载图像，我会遇到同样的问题：

image = Image.open(path)
image_array = np.array(image)

这是服务器端的代码：

def serving_input_fn(params):
""" See https://www.tensorflow.org/programmers_guide/
saved_model#using_savedmodel_with_estimators
and
See https://github.com/aws/sagemaker-python-sdk#creating-a-serving_input_fn
and https://docs.aws.amazon.com/sagemaker/latest/dg/
tf-training-inference-code-template.html
"""
# Download InceptionV3 if need be, in order to 
# compute high level features (called bottleneck here),
# which are then fed into the model
model_dir = './pretrained_model/'
maybe_download_and_extract(params['data_url'],
                           dest_directory=model_dir)
model_path = os.path.join(model_dir, params['model_file_name'])
with tf.gfile.FastGFile(model_path, 'rb') as f:
    graph_def = tf.GraphDef()
    graph_def.ParseFromString(f.read())
    bottleneck_tensor, resized_input_tensor, input_tensor = (
        tf.import_graph_def(
            graph_def,
            name='',
            input_map=None,
            return_elements=[
                params['bottleneck_tensor_name'],
                params['resized_input_tensor_name'],
                'DecodeJpeg:0',
            ]))
return tf.estimator.export.ServingInputReceiver(bottleneck_tensor, {
    INPUT_TENSOR_NAME: input_tensor
})

1 个答案:

答案 0 :(得分：0)

SageMaker现在支持批量预测，这可能是完成此任务的更简单方法。有关更多信息，请访问：https://docs.aws.amazon.com/sagemaker/latest/dg/how-it-works-batch.html

简而言之：

要执行批处理转换，请创建一个转换作业，其中包括以下信息：

  • 您要存储要转换的数据的S3存储桶的路径。
  • 您希望Amazon SageMaker用于转换作业的计算资源。计算资源是由Amazon SageMaker管理的ML计算实例。
  • 要在其中存储作业输出的S3存储桶的路径。
  • 要在转换作业中使用的模型的名称。
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