我对TensorFlow尤其是2.0版本非常陌生,因为API的示例不足,但它似乎比1.x版本更加方便。
到目前为止,我已经使用tf.estimator API训练了一个线性模型,并使用tf.estimator.exporter保存了该模型。
之后,我想使用tf.saved_model API加载此模型,并认为我成功了。但是,我对我的过程有一些疑问,因此这是我的代码快速查看:
所以,我使用tf.feature_column API创建了一个特征数组,它看起来像这样:
feature_columns =
[NumericColumn(key='geoaccuracy', shape=(1,), default_value=None, dtype=tf.float32, normalizer_fn=None),
NumericColumn(key='longitude', shape=(1,), default_value=None, dtype=tf.float32, normalizer_fn=None),
NumericColumn(key='latitude', shape=(1,), default_value=None, dtype=tf.float32, normalizer_fn=None),
NumericColumn(key='bidfloor', shape=(1,), default_value=None, dtype=tf.float32, normalizer_fn=None),
VocabularyListCategoricalColumn(key='adid', vocabulary_list=('115', '124', '139', '122', '121', '146', '113', '103', '123', '104', '147', '114', '149', '148'), dtype=tf.string, default_value=-1, num_oov_buckets=0),
VocabularyListCategoricalColumn(key='campaignid', vocabulary_list=('36', '31', '33', '28'), dtype=tf.string, default_value=-1, num_oov_buckets=0),
VocabularyListCategoricalColumn(key='exchangeid', vocabulary_list=('1241', '823', '1240', '1238'), dtype=tf.string, default_value=-1, num_oov_buckets=0),
...]
接下来,我使用我的特征列数组定义一个估计器,并对其进行训练。到目前为止,没有问题。
linear_est = tf.estimator.LinearClassifier(feature_columns=feature_columns)
在训练完我的模型后,我希望将其保存下来。这里开始产生了疑虑,以下是我的操作方式,但我不确定是否正确:
serving_input_parse = tf.feature_column.make_parse_example_spec(feature_columns=feature_columns)
""" view of the variable : serving_input_parse =
{'adid': VarLenFeature(dtype=tf.string),
'at': VarLenFeature(dtype=tf.string),
'basegenres': VarLenFeature(dtype=tf.string),
'bestkw': VarLenFeature(dtype=tf.string),
'besttopic': VarLenFeature(dtype=tf.string),
'bidfloor': FixedLenFeature(shape=(1,), dtype=tf.float32, default_value=None),
'browserid': VarLenFeature(dtype=tf.string),
'browserlanguage': VarLenFeature(dtype=tf.string)
...} """
# exporting the model :
linear_est.export_saved_model(export_dir_base='./saved',
serving_input_receiver_fn=tf.estimator.export.build_parsing_serving_input_receiver_fn(serving_input_receiver_fn),
as_text=True)
现在我尝试加载模型,但是我不知道如何使用已加载的模型,以便使用来自pandas dataframe的原始数据来调用预测。
loaded = tf.saved_model.load('saved/1573144361/')
还有一件事,我试图查看模型的签名,但我无法真正理解我的输入形状发生了什么
MetaGraphDef with tag-set: 'serve' contains the following SignatureDefs:
signature_def['classification']:
The given SavedModel SignatureDef contains the following input(s):
inputs['inputs'] tensor_info:
dtype: DT_STRING
shape: (-1)
name: input_example_tensor:0
The given SavedModel SignatureDef contains the following output(s):
outputs['classes'] tensor_info:
dtype: DT_STRING
shape: (-1, 2)
name: head/Tile:0
outputs['scores'] tensor_info:
dtype: DT_FLOAT
shape: (-1, 2)
name: head/predictions/probabilities:0
Method name is: tensorflow/serving/classify
signature_def['predict']:
The given SavedModel SignatureDef contains the following input(s):
inputs['examples'] tensor_info:
dtype: DT_STRING
shape: (-1)
name: input_example_tensor:0
The given SavedModel SignatureDef contains the following output(s):
outputs['all_class_ids'] tensor_info:
dtype: DT_INT32
shape: (-1, 2)
name: head/predictions/Tile:0
outputs['all_classes'] tensor_info:
dtype: DT_STRING
shape: (-1, 2)
name: head/predictions/Tile_1:0
outputs['class_ids'] tensor_info:
dtype: DT_INT64
shape: (-1, 1)
name: head/predictions/ExpandDims:0
outputs['classes'] tensor_info:
dtype: DT_STRING
shape: (-1, 1)
name: head/predictions/str_classes:0
outputs['logistic'] tensor_info:
dtype: DT_FLOAT
shape: (-1, 1)
name: head/predictions/logistic:0
outputs['logits'] tensor_info:
dtype: DT_FLOAT
shape: (-1, 1)
name: linear/linear_model/linear/linear_model/linear/linear_model/weighted_sum:0
outputs['probabilities'] tensor_info:
dtype: DT_FLOAT
shape: (-1, 2)
name: head/predictions/probabilities:0
Method name is: tensorflow/serving/predict
signature_def['regression']:
The given SavedModel SignatureDef contains the following input(s):
inputs['inputs'] tensor_info:
dtype: DT_STRING
shape: (-1)
name: input_example_tensor:0
The given SavedModel SignatureDef contains the following output(s):
outputs['outputs'] tensor_info:
dtype: DT_FLOAT
shape: (-1, 1)
name: head/predictions/logistic:0
Method name is: tensorflow/serving/regress
signature_def['serving_default']:
The given SavedModel SignatureDef contains the following input(s):
inputs['inputs'] tensor_info:
dtype: DT_STRING
shape: (-1)
name: input_example_tensor:0
The given SavedModel SignatureDef contains the following output(s):
outputs['classes'] tensor_info:
dtype: DT_STRING
shape: (-1, 2)
name: head/Tile:0
outputs['scores'] tensor_info:
dtype: DT_FLOAT
shape: (-1, 2)
name: head/predictions/probabilities:0
Method name is: tensorflow/serving/classify