TensorFlow estimator.DNNClassifier: export_savedmodel caused "ValueError: Invalid feature"

Question

我阅读了很多主题，但是 none 的答案对我有帮助...

我有 DNN 分类器：

import tensorflow as tf
feature_columns = []
for key in X_train.keys():
    feature_columns.append(tf.feature_column.numeric_column(key=key))

classifier = tf.estimator.DNNClassifier(
    feature_columns=feature_columns,
    hidden_units=[10, 20, 10],
    n_classes=2
    )

def train_input_fn(features, labels, batch_size):
    """An input function for training"""
    dataset = tf.data.Dataset.from_tensor_slices((dict(features), labels))
    dataset = dataset.shuffle(10).repeat().batch(batch_size)
    return dataset

#train the Model
batch_size = 100
train_steps = 400

for i in range(0,100):
    classifier.train(
        input_fn=lambda:train_input_fn(X_train, y_train, batch_size),
        steps=train_steps
        )

DataFrame X_train 包含 452 个数字列（其中大部分 - 由 OneHodEncode 虚拟列转换）：形状为 (84692, 452)。同样是 len(feature_columns) = 452

但是当我尝试使用脚本保存模型时：

def serving_input_receiver_fn():
    feature_spec = tf.feature_column.make_parse_example_spec(feature_columns)
    return tf.estimator.export.build_parsing_serving_input_receiver_fn(feature_spec)()

classifier.export_savedmodel(export_dir_base="export_model/", serving_input_receiver_fn=_serving_input_receiver_fn)

我收到一个错误：

ValueError: Invalid feature dummy_feature_N_value_M:0.

还尝试使用另一个脚本来保存（但在这里我不了解每个参数值...）：

def serving_input_receiver_fn():
    serialized_tf_example = tf.placeholder(dtype=tf.string, shape=[None], name='input_tensors')
    receiver_tensors      = {"predictor_inputs": serialized_tf_example}
    feature_spec          = {"words": tf.FixedLenFeature([452],tf.float32)}
    features              = tf.parse_example(serialized_tf_example, feature_spec)
    return tf.estimator.export.ServingInputReceiver(features, receiver_tensors)

classifier.export_savedmodel(export_dir_base="export_model/", serving_input_receiver_fn=serving_input_receiver_fn)

但它也returns差点报错：

ValueError: Feature dummy_feature_N_value_M is not in features dictionary.

当我检查 feature_columns 列表时 - 是否存在：

_NumericColumn(key='dummy_feature_N_value_M', shape=(1,), default_value=None, dtype=tf.float32, normalizer_fn=None),

我做错了什么？

Answer 1

不知道那是什么...但现在一切正常。

首先，我尝试不使用自己创建的 OneHodEncode 虚拟列，而是输入带有分类列的初始数据帧 "train_dummy_features"：

# split columns and indexes of categorical and continues columns
categorical_columns = list(train_dummy_features.select_dtypes(include=['category','object']))
print(categorical_columns)
numeric_columns = list(train_dummy_features.select_dtypes(include=['int','uint8']))
print(numeric_columns)
cat_features_indexes = [train_dummy_features.columns.get_loc(c) for c in train_dummy_features.columns if c in categorical_columns] 
print(cat_features_indexes)
continues_features_indexes = [train_dummy_features.columns.get_loc(c) for c in train_dummy_features.columns if c not in categorical_columns] 
print(continues_features_indexes)

然后使用 TensorFlow 函数创建 feature_columns 列表：

numeric_features = [tf.feature_column.numeric_column(key = column) for column in numeric_columns]
print(numeric_features)
categorical_features = [
    tf.feature_column.embedding_column(
        categorical_column = tf.feature_column.categorical_column_with_vocabulary_list
                             (key = column
                              , vocabulary_list = train_dummy_features[column].unique()
                             ),
        dimension = len(train_dummy_features[column].unique())
        ) 
    for column in categorical_columns
    ]
print(categorical_features[3])

feature_columns = numeric_features + categorical_features
feature_columns[2]

并将带有分类列的初始数据帧 "train_dummy_features" 放入 X_train:

X = train_dummy_features
y = train_measure # since we already have dataframe with the measure

X_train, y_train = X, y

声明 "classifier" 和 "train_input_fn" 如初始 post 中指定的，经过训练的分类器。

在那之后

def serving_input_receiver_fn():
    #feature_spec = {INPUT_TENSOR_NAME: tf.FixedLenFeature(dtype=tf.float32, shape=[452])}
    feature_spec = tf.feature_column.make_parse_example_spec(feature_columns)
    return tf.estimator.export.build_parsing_serving_input_receiver_fn(feature_spec)()

classifier.export_savedmodel(export_dir_base="export_model2/", serving_input_receiver_fn=serving_input_receiver_fn)

和

def serving_input_receiver_fn():
    serialized_tf_example = tf.placeholder(dtype=tf.string, shape=[None], name='input_tensors')
    receiver_tensors      = {"predictor_inputs": serialized_tf_example}
    feature_spec          = tf.feature_column.make_parse_example_spec(feature_columns) #{"words": tf.FixedLenFeature([len(feature_columns)],tf.float32)}
    features              = tf.parse_example(serialized_tf_example, feature_spec)
    return tf.estimator.export.ServingInputReceiver(features, receiver_tensors)

classifier.export_savedmodel(export_dir_base="export_model3/", serving_input_receiver_fn=serving_input_receiver_fn)

成功导出模型。

我试图重复昨天导致错误的第一个版本的步骤 - 但现在无法重复错误。

因此，描述的步骤已成功训练和导出 tf.estimator.DNNClassifier 模型

TensorFlow estimator.DNNClassifier: export_savedmodel caused "ValueError: Invalid feature"

TensorFlow estimator.DNNClassifier: export_savedmodel caused "ValueError: Invalid feature"

python

tensorflow

tensorflow-estimator