我可以不带“ with”语句调用tf.variable_scope吗？

Question

I want to call tensorflow's python APIs in matlab (see https://www.mathworks.com/help/matlab/matlab_external/call-python-from-matlab.html ). The matlab does not support the "with" statement. I can not create a tf.variable_scope without a "with" statement. I have tried the two codes below, but both do not work. Is there any solution?

Python:

import tensorflow as tf
with tf.variable_scope('123') as vs:
    print(vs.name)  # OK
vs2 = tf.variable_scope('456')
print(vs2.name)  # AttributeError: 'variable_scope' object has no attribute 'name'

Matlab:

vs = py.tensorflow.variable_scope('GRAPH', pyargs('reuse', py.tensorflow.AUTO_REUSE));
vs.name  % No appropriate method, property, or field 'name' for class 'py.tensorflow.python.ops.variable_scope.variable_scope'.

Answer 1

You can rewrite the python context like

import tensorflow as tf

with tf.variable_scope('123') as vs:
    print(vs.name)  # OK


vs2_obj = tf.variable_scope('456')
vs2 = vs2_obj.__enter__()
try:
    print(vs2.name)  # OK as well
finally:
    vs2_obj.__exit__(None, None, None)

But I guess there are some site-effects.

Explanation: There is a difference between a context-object vs2_obj and the current context vs2 itself.

This gives the output

123
456

Answer 2

Also, I write a tool class to mimic "with" statements in matlab.

helper.py:

class With(object):
    def __init__(self, obj):
        self._obj = obj
        self._p = self._obj.__enter__()

    def __del__(self):
        self._obj.__exit__(None, None, None)

    def get(self):
        return self._p

Matlab:

with_vs = py.helper.With(py.tensorflow.variable_scope('X'));
with_vs.get().name
...
clear with_vs;