tf.reduce_mean

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最新推荐文章于 2022-03-28 20:26:24 发布

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本文详细介绍了TensorFlow中reduce_mean函数的功能及用法，包括如何计算张量各维度的平均值，以及函数参数说明。通过实例展示了不同参数设置下reduce_mean的计算结果。

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reduce_mean(
    input_tensor,
    axis=None,
    keepdims=None,
    name=None,
    reduction_indices=None,
    keep_dims=None
)

Defined in tensorflow/python/ops/math_ops.py.

See the guide: Math > Reduction

Computes the mean of elements across dimensions of a tensor. (deprecated arguments)

SOME ARGUMENTS ARE DEPRECATED. They will be removed in a future version.Instructions for updating:keep_dims is deprecated, use keepdims instead

Reduces input_tensor along the dimensions given in axis.Unless keepdims is true, the rank of the tensor is reduced by 1 for eachentry in axis. If keepdims is true, the reduced dimensionsare retained with length 1.

If axis has no entries, all dimensions are reduced, and atensor with a single element is returned.

For example:

x = tf.constant([[1., 1.], [2., 2.]])
tf.reduce_mean(x)  # 1.5
tf.reduce_mean(x, 0)  # [1.5, 1.5]
tf.reduce_mean(x, 1)  # [1.,  2.]

Args:

input_tensor: The tensor to reduce. Should have numeric type.
axis: The dimensions to reduce. If None (the default), reduces all dimensions. Must be in the range [-rank(input_tensor), rank(input_tensor)).
keepdims: If true, retains reduced dimensions with length 1.
name: A name for the operation (optional).
reduction_indices: The old (deprecated) name for axis.
keep_dims: Deprecated alias for keepdims.

Returns:

The reduced tensor.

Numpy Compatibility

Equivalent to np.mean

Please note that np.mean has a dtype parameter that could be used tospecify the output type. By default this is dtype=float64. On the otherhand, tf.reduce_mean has an aggressive type inference from input_tensor,for example:

x = tf.constant([1, 0, 1, 0])
tf.reduce_mean(x)  # 0
y = tf.constant([1., 0., 1., 0.])
tf.reduce_mean(y)  # 0.5

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上次更新日期：一月 27, 2018