我按照TensorFlowdocs从三个NumPy数组生成一个tf.record,但是,我在尝试序列化数据时出错。我希望得到的tfrecord
包含三个特性
import numpy as np
import pandas as pd
# some random data
x = np.random.randn(85)
y = np.random.randn(85,2128)
z = np.random.choice(range(10),(85,155))
def _float_feature(value):
"""Returns a float_list from a float / double."""
return tf.train.Feature(float_list=tf.train.FloatList(value=[value]))
def _int64_feature(value):
"""Returns an int64_list from a bool / enum / int / uint."""
return tf.train.Feature(int64_list=tf.train.Int64List(value=[value]))
def serialize_example(feature0, feature1, feature2):
"""
Creates a tf.Example message ready to be written to a file.
"""
# Create a dictionary mapping the feature name to the tf.Example-compatible
# data type.
feature = {
'feature0': _float_feature(feature0),
'feature1': _float_feature(feature1),
'feature2': _int64_feature(feature2)
}
# Create a Features message using tf.train.Example.
example_proto = tf.train.Example(features=tf.train.Features(feature=feature))
return example_proto.SerializeToString()
features_dataset = tf.data.Dataset.from_tensor_slices((x, y, z))
features_dataset
<TensorSliceDataset shapes: ((), (2128,), (155,)), types: (tf.float64, tf.float32, tf.int64)>
for f0,f1,f2 in features_dataset.take(1):
print(f0)
print(f1)
print(f2)
def tf_serialize_example(f0,f1,f2):
tf_string = tf.py_function(
serialize_example,
(f0,f1,f2), # pass these args to the above function.
tf.string) # the return type is `tf.string`.
return tf.reshape(tf_string, ()) # The result is a scalar
然而,当试图运行tf_serialize_example(f0,f1,f2)
我得到一个错误:
InvalidArgumentError: TypeError: <tf.Tensor: shape=(2128,), dtype=float32, numpy=
array([-0.5435242 , 0.97947884, -0.74457455, ..., has type tensorflow.python.framework.ops.EagerTensor, but expected one of: int, long, float
Traceback (most recent call last):
我想原因是,我的功能是数组而不是数字。我如何使这段代码适用于特性,这些特性是数组而不是数字
好吧,我现在抽时间仔细看看。我注意到
features_dataset
和tf_serialize_example
的用法来自tensorflow webppage的教程。我不知道这种方法的优点是什么以及如何解决这个问题但是这里有一个工作流程应该适用于您的代码(我重新打开了生成的tfrecords文件,它们很好)
这段代码的主要区别在于,您将numpy数组而不是tensorflow张量馈送到
serialize_example
。希望这有帮助相关问题 更多 >
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