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Question bank: 128 questions.
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Keyboard shortcuts: Left and Right change questions, F flags a question, and Enter checks or advances where appropriate.
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Frequently Asked Questions
What does tanh return?
It returns a smooth value strictly between negative one and positive one.
Why is tanh called zero-centered?
Its output range contains balanced negative and positive values around zero.
What is the tanh derivative?
The derivative is 1 − tanh²(x), also written as sech²(x).
When does tanh saturate?
It saturates when large-magnitude inputs push outputs close to negative or positive one.
How does tanh differ from sigmoid?
Tanh ranges from negative one to one, while sigmoid ranges from zero to one.
Can tanh cause vanishing gradients?
Yes. Its derivative becomes very small in strongly saturated regions.
Why use Plotly reports?
Plotly provides responsive, interactive charts for scores, topics, timing, and history.
Does the quiz save progress?
Yes. Unfinished attempts are stored locally in the current browser.
Can I retake only missed questions?
Yes. The results panel includes a dedicated incorrect-question retake option.