您能否推荐一个库(或代码片段)来在Android API18上实现预处理Python方法(例如numpy.expand_dims()或img_to_array) (以部署基于TensorFlow移动的应用程序)?有一些类似于Java上的Python的库(例如ND4J),但它们需要运行API21或更高级别的设备或仿真器。
from keras.preprocessing.image import img_to_array
import numpy as np
    image = img_to_array(image)
    image = np.expand_dims(image, axis=0)
    image /= 255.发布于 2017-09-06 00:41:41
我有一个互动会话:
In [168]: np.source(np.expand_dims)
In file: /usr/local/lib/python3.5/dist-packages/numpy/lib/shape_base.py
def expand_dims(a, axis):
    """
    .... docs
    """
    a = asarray(a)
    shape = a.shape
    if axis > a.ndim or axis < -a.ndim - 1:
        # 2017-05-17, 1.13.0
        warnings.warn("Both axis > a.ndim and axis < -a.ndim - 1 are "
                      "deprecated and will raise an AxisError in the future.",
                      DeprecationWarning, stacklevel=2)
    # When the deprecation period expires, delete this if block,
    if axis < 0:
        axis = axis + a.ndim + 1
    # and uncomment the following line.
    # axis = normalize_axis_index(axis, a.ndim + 1)
    return a.reshape(shape[:axis] + (1,) + shape[axis:])所以基本上它使用了reshape,它的形状在正确的位置包含了一个大小为1的维度。使用[:,:,np.newaxis,...]语法也可以做到这一点。
其中是否可以移植到Java取决于该语言中的数组实现。
https://stackoverflow.com/questions/46058060
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