The video tutorial explains the concept of gradient descent and its role in minimizing the loss function. It covers how to compute derivatives of the loss with respect to various parameters, focusing on the impact of parameters like WA and WX on the loss. The tutorial delves into the multiple routes through which these parameters can affect the loss function and emphasizes the need to compute gradients for each route. The video concludes with a detailed explanation of the backpropagation through time algorithm, highlighting its importance in updating shared parameters across different time steps.

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