Cannot import name relu6

Just execute these commands:

git clone https://github.com/apple/coremltools.git
cd coremltools
cmake . -DPYTHON=$(which python) -DPYTHON_CONFIG=$(which python-config)
make
pip install -e .

FPN网络训练报错PaddingFIFOQueue '_1_get_batch/batch/padding_fifo_queue' is closed and has insufficient elements (requested 1, current size 0)

https://github.com/DetectionTeamUCAS/FPN_Tensorflow
按说明设置自己的训练集后，进入tool/运行train.py后报错：

PaddingFIFOQueue '_1_get_batch/batch/padding_fifo_queue' is closed and has insufficient elements (requested 1, current size 0)

查了一下，应该是xml文件中box坐标范围导致的。修改data/io/convert_data/io/convert_to_tfrecord.py中line68为

  gtbox_label = np.array(box_list, dtype=np.int32)  # [x1, y1. x2, y2, label]

  xmin, ymin, xmax, ymax, label = gtbox_label[:, 0], gtbox_label[:, 1], gtbox_label[:, 2],\
      gtbox_label[:, 3], gtbox_label[:, 4]

  xmin = np.where(xmin <= 0, 1, xmin)
  ymin = np.where(ymin <= 0, 1, ymin)
  xmax = np.where(xmax >= img_width, img_width-1, xmax)
  ymax = np.where(ymax >= img_height, img_height-1, ymax)

  # [ymin, xmin, ymax, xmax, label]
  gtbox_label = np.transpose(np.stack([ymin, xmin, ymax, xmax, label], axis=0))

即可。

TypeError: ...has type str, but expected one of: bytes

在python3环境中将数据转为TFRecord时遇到的问题
return tf.train.Feature(bytes_list=tf.train.BytesList(value=[value]))
TypeError: 'rock' has type str, but expected one of: bytes

解决方式：

转byte feature时用tf.compat.as_bytes(value)将字节或 Unicode 转换为 bytes，使用 UTF-8 编码文本：

def _bytes_feature(value):

  value = tf.compat.as_bytes(value)#####

  return tf.train.Feature(bytes_list=tf.train.BytesList(value=[value]))

pip2与pip3共存

之前修改了导致pip2无法使用，导致一些开发工具无法使用。 可以先解除 python3的软连接, 然后再修改成 python2的. mac 自带的是 python2.7
1. 先获取2.7的路径:
which python2.7, 我的是/usr/bin/python2.7

2. 解除原有链接 unlink /usr/bin/python

3. 恢复默认链接: sudo ln -s python2 /usr/bin/python