Common TensorFlow 2.x Migration Errors and Fixes
When migrating legacy TensorFlow 1.x code to TensorFlow 2.x, several common attribute errors may occur due to API changes. Below are typical issues and their solutions:
1. module 'tensorflow' has no attribute 'placeholder'
tf.placeholder was removed in TensorFlow 2.x. To retain 1.x behavior:
import tensorflow.compat.v1 as tf
tf.disable_v2_behav ...
Posted on Thu, 30 Jul 2026 16:47:00 +0000 by laurus
Entity Framework Core Integration in .NET Core
Create a class library named NetCoreDemo.EF and reference the packages Microsoft.EntityFrameworkCore, Microsoft.EntityFrameworkCore.SqlServer.Design, Microsoft.EntityFrameworkCore.SqlServer, and Microsoft.EntityFrameworkCore.Tools.
Method 1:
Tools > NuGet Package Manager > Package Manager Console (the default project must be NetCoreDemo.E ...
Posted on Wed, 08 Jul 2026 16:19:46 +0000 by affluent980
Setting Up Flask ORM with SQLAlchemy and Database Migrations
To use an ORM in Flask, install the required packages:
pip3 install sqlalchemy flask-sqlalchemy
Create a MySQL database for your application:
CREATE DATABASE flask DEFAULT CHARSET utf8 COLLATE utf8_general_ci;
Configure the database URI in your Flask app:
app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://root:123456@localhost:3306/flask'
Init ...
Posted on Thu, 18 Jun 2026 16:52:43 +0000 by sunnypal
Migrating GitLab Omnibus Instances Between Docker Hosts and Resolving Permission Errors
Environment Specifications
OS: CentOS 7
Container Engine: Docker v26.0.0
Image: twang2218/gitlab-ce-zh
Migration Workflow
Pre-Migration Preparation
Identify the initial launch configuration from the source machine.
docker inspect --format='{{json .HostConfig.PortBindings}}' gitlab > bindings.json
Document volume mounts to ensure consisten ...
Posted on Sun, 17 May 2026 18:41:23 +0000 by ElectricShaka
Flask to FastAPI: A Comparative Guide to Common Patterns
Installation and Basic Application
Flask
pip install flask
Other package managers such as Poetry, Pipenv, and Conda also work. For example:
poetry add flask
FastAPI
pip install fastapi uvicorn
FastAPI does not ship with a built-in development server; Uvicorn is the recommended ASGI server.
A minimal "Hello, world" application:
Flas ...
Posted on Fri, 15 May 2026 01:45:57 +0000 by dakkonz
InfluxDB Data Migration Techniques
InfluxDB provides multiple approaches for migrating time-series data between systems or performing backups.
Exporting Data
Command-Line Query Export
The influx command-line interface allows direct querying and exporting of measurements to external files.
influx -database 'target_db' -execute 'SELECT * FROM sensor_data' -format 'csv' > backup ...
Posted on Mon, 11 May 2026 06:44:44 +0000 by agent47