Mismatched Figure 13 values in Model Optimizations chapter #527

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opened 2026-03-22 15:45:14 -05:00 by GiteaMirror · 0 comments
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Originally created by @Tess314 on GitHub (Mar 19, 2026).

In the Model Optimizations chapter, I came across a mismatch between the values in Figure 13 and the text above describing it.

Text description: "As shown in Figure 13 performing a 32-bit floating-point addition (FAdd) consumes approximately 0.9 pJ, whereas a 16-bit floating-point addition only requires 0.4 pJ. Similarly, a 32-bit integer addition costs 0.1 pJ, while an 8-bit integer addition is significantly lower at just 0.03 pJ."

Figure 13 actual values:
Image

Figure 13 shows integer operations, not floating-point operations. So either the figure or text needs changed to reflect this.

Hope this helps!
Tess

Originally created by @Tess314 on GitHub (Mar 19, 2026). In the Model Optimizations chapter, I came across a mismatch between the values in Figure 13 and the text above describing it. Text description: "As shown in Figure 13 performing a 32-bit floating-point addition (FAdd) consumes approximately 0.9 pJ, whereas a 16-bit floating-point addition only requires 0.4 pJ. Similarly, a 32-bit integer addition costs 0.1 pJ, while an 8-bit integer addition is significantly lower at just 0.03 pJ." Figure 13 actual values: <img width="675" height="331" alt="Image" src="https://github.com/user-attachments/assets/f21b848b-9921-4db0-83b0-e8787576afca" /> Figure 13 shows **integer** operations, **not floating-point** operations. So either the figure or text needs changed to reflect this. Hope this helps! Tess
GiteaMirror added the area: booktype: errata labels 2026-03-22 15:45:14 -05:00
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Reference: github-starred/cs249r_book#527