RSSM Series on WorldSense Tech Blog

Understanding RSSM Through Code (6): Default Config, Four Formulas, and the Code↔Math↔Semantics Map

Mon, 24 Aug 2026 00:00:00 +0000

Understanding RSSM Through Code · 第 6 篇 / 共 6 篇

Series contents (you are on part 6, bolded; prev/next at the bottom):

(1) Where RSSM Sits & the Stochastic State

(2) Prior/Posterior, Straight-Through & unimix

(3) _core(), deter=8192 & Block GRU

(4) KL Balancing, Free Nats & Final KL

(5) Imagine, Observe vs. Imagine & Reset 6. (6) Default Config, Four Formulas & the Map

25. Default Config: Split into “RSSM Architecture” and “World-Model Training”

To avoid mixing “RSSM architecture parameters” with “world-model / agent training config,” the configuration is split into two tables below.

Understanding RSSM Through Code (5): Imagine, Observe vs. Imagine, Sequence Training, and Reset

Sun, 23 Aug 2026 00:00:00 +0000

Understanding RSSM Through Code · 第 5 篇 / 共 6 篇

Series contents (you are on part 5, bolded; prev/next at the bottom):

(1) Where RSSM Sits & the Stochastic State

(2) Prior/Posterior, Straight-Through & unimix

(3) _core(), deter=8192 & Block GRU

(4) KL Balancing, Free Nats & Final KL 5. (5) Imagine, Observe vs. Imagine & Reset

(6) Default Config, Four Formulas & the Map

20. Imagine: How Does RSSM Run Without Observations?

This is the most elegant part of RSSM.

Understanding RSSM Through Code (4): KL Balancing, Free Nats, and the Final KL Combination

Sat, 22 Aug 2026 00:00:00 +0000

Understanding RSSM Through Code · 第 4 篇 / 共 6 篇

Series contents (you are on part 4, bolded; prev/next at the bottom):

(1) Where RSSM Sits & the Stochastic State

(2) Prior/Posterior, Straight-Through & unimix

(3) _core(), deter=8192 & Block GRU 4. (4) KL Balancing, Free Nats & Final KL

(5) Imagine, Observe vs. Imagine & Reset

(6) Default Config, Four Formulas & the Map

14. Complete Observe Phase Data Flow (Observe / Imagine in One Framework)

We can now draw the RSSM state-transition framework and put Observe and Imagine inside the same _core() transition framework:

Understanding RSSM Through Code (3): Deterministic Transition _core(), deter=8192, and Block GRU

Fri, 21 Aug 2026 00:00:00 +0000

Understanding RSSM Through Code · 第 3 篇 / 共 6 篇

Series contents (you are on part 3, bolded; prev/next at the bottom):

(1) Where RSSM Sits & the Stochastic State

(2) Prior/Posterior, Straight-Through & unimix 3. (3) _core(), deter=8192 & Block GRU

(4) KL Balancing, Free Nats & Final KL

(5) Imagine, Observe vs. Imagine & Reset

(6) Default Config, Four Formulas & the Map

9. The Real Deterministic Transition: `_core()`

This is the most worthwhile part of rssm.py to read.

Understanding RSSM Through Code (2): Prior/Posterior, Straight-Through Sampling, and unimix

Thu, 20 Aug 2026 00:00:00 +0000

Understanding RSSM Through Code · 第 2 篇 / 共 6 篇

Series contents (you are on part 2, bolded; prev/next at the bottom):

(1) Where RSSM Sits & the Stochastic State 2. (2) Prior/Posterior, Straight-Through & unimix

(3) _core(), deter=8192 & Block GRU

(4) KL Balancing, Free Nats & Final KL

(5) Imagine, Observe vs. Imagine & Reset

(6) Default Config, Four Formulas & the Map

4. Translating the Source Code into Mathematical Formulas (Watch the Time Index)

DreamerV3’s recurrence relation:

Understanding RSSM Through Code (1): Where RSSM Sits in DreamerV3 and the Stochastic State

Wed, 19 Aug 2026 00:00:00 +0000

Understanding RSSM Through Code · 第 1 篇 / 共 6 篇

Series contents (you are on part 1, bolded; prev/next at the bottom): 1. (1) Where RSSM Sits & the Stochastic State 2. (2) Prior/Posterior, Straight-Through & unimix 3. (3) _core(), deter=8192 & Block GRU 4. (4) KL Balancing, Free Nats & Final KL 5. (5) Imagine, Observe vs. Imagine & Reset 6. (6) Default Config, Four Formulas & the Map

Source Code Reading Guide