compatibility

问题 I am using Python 3.6 and Tensorflow 2.0, and have some Keras codes: import keras from keras.models import Sequential from keras.layers import Dense model = Sequential() model.add(Dense(1)) model.compile(optimizer='adam',loss='mean_squared_error',metrics=['accuracy']) However I got the error: "Keras requires TensorFlow 2.2 or higher. Install TensorFlow via pip install tensorflow " when trying to run it. I checked on https://keras.io/, it says Keras was built on Tensorflow 2.0. So I am

问题 I came across bizarre eval behavior in Python 3 - local variables aren't picked up when eval is called in a list comprehension. def apply_op(): x, y, z = [0.5, 0.25, 0.75] op = "x,y,z" return [eval(o) for o in op.split(",")] print(apply_op()) It errors in Python 3: ▶ python --version Python 3.4.3 ▶ python eval.py Traceback (most recent call last): File "eval.py", line 7, in <module> print(apply_op()) File "eval.py", line 5, in apply_op return [eval(o) % 1 for o in op.split(",")] File "eval.py

问题 I was having a look at the documentation for BM_GETCHECK and it seems that this functionality is only supported on Windows Vista and above. That is, this is not a supported message in Windows XP. A quick search online doesn't immediately yield an alternative way of getting the control state. Several other messages (this for example) that I would also expect to work on Windows XP are reported to not be supported. Does anyone have any insight into this? How does one generally handle Windows XP

问题 I am recording a video in android like this List<Camera.Size> list = myCamera.getParameters().getSupportedPictureSizes(); Parameters parameters = myCamera.getParameters(); parameters.setColorEffect(coloreffects.get(index_color_effect)); myCamera.setParameters(parameters); mediaRecorder = new MediaRecorder(); myCamera.unlock(); mediaRecorder.setCamera(myCamera); mediaRecorder.setOrientationHint(90); mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER); mediaRecorder.setVideoSource

问题 I'm working with a Jupyter Notebook written in Python 3, and I would like to run Python 2 scripts from within that Notebook. I was wondering if it's possible to run Shell commands from within the Notebook, and have these Shell commands running under a different environment. For example, if env2 is a Conda environment that runs Python 2, and env3 runs Python 3, and my Jupyter Notebook runs in env3, maybe I could write within my Notebook: ! source activate env2 ! script_that_uses_python2.py and

问题 Upgrading Java from 7u161 to 7u171 prevents JBoss AS 7.1.1.Final from starting. I know JBoss AS 7.1.1 is EOL but for compatibility reasons, we still need to run this version. Very early in the startup, a NullPointerException occurs in some JBoss method. Following is the exception: Exception in thread "main" javax.xml.parsers.FactoryConfigurationError: Provider __redirected.__SAXParserFactory could not be instantiated: java.lang.NullPointerException [...] Caused by: java.lang

问题 Upgrading Java from 7u161 to 7u171 prevents JBoss AS 7.1.1.Final from starting. I know JBoss AS 7.1.1 is EOL but for compatibility reasons, we still need to run this version. Very early in the startup, a NullPointerException occurs in some JBoss method. Following is the exception: Exception in thread "main" javax.xml.parsers.FactoryConfigurationError: Provider __redirected.__SAXParserFactory could not be instantiated: java.lang.NullPointerException [...] Caused by: java.lang

问题 Despite all that has been said and written on Python2 vs Python3, I have been unable to identify why the developers made it impossible to mix Python2 and Python3 code. Surely there must be a reason for this? In Fortran, for instance, the many versions are incompatible with each other, but they can still happily co-exist within the same project. The same applies to C and C++: some C code is not compatible with C++, but the compiler is able to recognize the correct language using the file

问题 I have been working with the following class named City @ToString @AllArgsConstructor public class City { Integer id; String name; } and tried to convert it to a record called CityRecord as record CityRecord(Integer id, String name) {} // much cleaner! But moving to such a representation, one of our unit tests starts failing. The tests internally deal with a list of cities read from a JSON file and mapped to an object further counting the cities while grouping them under into a Map .

问题 I would like to install several different versions of perl in my home directory. I tried using App::perlbrew, but XS modules from one version were causing segfaults in the other version. Is there any way to install multiple versions of perl and have them automatically keep their XS modules separate? 回答1: You can install each perl completely separate from any other perl installation. It's binaries and modules will be completely separate from each other. Essentially, when you install each perl