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人工智能工作流程:机器学习、视觉识别和NLP | MOOC中国 - 慕课改变你,你改变世界


AI Workflow: Machine Learning, Visual Recognition and NLP

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  • 完成时间大约为 5 个小时
  • 高级
  • 英语


This is the fourth course in the IBM AI Enterprise Workflow Certification specialization. You are STRONGLY encouraged to complete these courses in order as they are not individual independent courses, but part of a workflow where each course builds on the previous ones. 

Course 4 covers the next stage of the workflow, setting up models and their associated data pipelines for a hypothetical streaming media company. The first topic covers the complex topic of evaluation metrics, where you will learn best practices for a number of different metrics including regression metrics, classification metrics, and multi-class metrics, which you will use to select the best model for your business challenge. The next topics cover best practices for different types of models including linear models, tree-based models, and neural networks. Out-of-the-box Watson models for natural language understanding and visual recognition will be used. There will be case studies focusing on natural language processing and on image analysis to provide realistic context for the model pipelines.
By the end of this course you will be able to:
Discuss common regression, classification, and multilabel classification metrics
Explain the use of linear and logistic regression in supervised learning applications
Describe common strategies for grid searching and cross-validation
Employ evaluation metrics to select models for production use
Explain the use of tree-based algorithms in supervised learning applications
Explain the use of Neural Networks in supervised learning applications
Discuss the major variants of neural networks and recent advances
Create a neural net model in Tensorflow
Create and test an instance of Watson Visual Recognition
Create and test an instance of Watson NLU

Who should take this course?
This course targets existing data science practitioners that have expertise building machine learning models, who want to deepen their skills on building and deploying AI in large enterprises. If you are an aspiring Data Scientist, this course is NOT for you as you need real world expertise to benefit from the content of these courses.
What skills should you have?
It is assumed that you have completed Courses 1 through 3 of the IBM AI Enterprise Workflow specialization and you have a solid understanding of the following topics prior to starting this course: Fundamental understanding of Linear Algebra; Understand sampling, probability theory, and probability distributions; Knowledge of descriptive and inferential statistical concepts; General understanding of machine learning techniques and best practices; Practiced understanding of Python and the packages commonly used in data science: NumPy, Pandas, matplotlib, scikit-learn; Familiarity with IBM Watson Studio; Familiarity with the design thinking process.


Model Evaluation and Performance Metrics

This week covers model selection, evaluation and performance metrics. The focus is on evaluating models iteratively for improvements. You will survey the landscape of evaluation metrics and linear models in order to ensure you are comfortable using implementing baseline models. The materials build up to the case study where you will use natural language processing in a classification setting. When you are done iterating on your model you will connect its model performance to business metrics as an approach to better understand model utility.

Building Machine Learning and Deep Learning Models

This week is primarily focused on building supervised learning models. We will survey available methods in two popular and effective areas of machine learning: tree-based algorithms and deep-learning algorithms. We will cover the use of tree-based methods like random forests and boosting along with other ensemble approaches. Many of these approaches serve as an important middle layer between interpretable linear models and difficult to interpret deep-learning models. For deep-learning we will use a pre-built visual recognition model and use TensorFlow to demonstrate how to build, turn and iterate on neural networks. We will also make sure that you understand popular neural network architectures. In the case study you will implement a convolutional neural network and ready it for deployment.

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