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Newton's method and the Hessian for Softmax Logistic Regression
Here's one issue:
You have $\mathbf{w}\in \mathbb{R}^{n_\text{features} n_\text{classes}}$
instead of $\mathbf{w}\in \mathbb{R}^{n_\text{features} (n_\text{classes}-1)}$. One of the relative class ...
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