Optimizing ising for spin I>1/2

  • Context: Graduate 
  • Thread starter Thread starter zeta
  • Start date Start date
  • Tags Tags
    Spin
Click For Summary
SUMMARY

This discussion focuses on optimizing an Ising model with spin 7/2 using simulated annealing for a pattern recognition task. The system consists of a 40x40 grid, resulting in 8 states per node due to the spin configuration. The primary challenge identified is determining the equivalent of thermal fluctuations and the method for transitioning between neighboring states in this context. The discussion also clarifies that this scenario is more accurately described by the Heisenberg model, as it involves spins greater than 1/2.

PREREQUISITES
  • Understanding of Ising models and their applications in statistical mechanics.
  • Familiarity with simulated annealing as an optimization technique.
  • Knowledge of the Heisenberg model and its implications for spin systems.
  • Basic concepts of pattern recognition tasks in computational contexts.
NEXT STEPS
  • Research the implementation of simulated annealing for Ising models in Python using libraries like NumPy.
  • Explore the mathematical formulation of the Heisenberg model and its differences from the Ising model.
  • Investigate methods for defining thermal fluctuations in spin systems and their impact on state transitions.
  • Learn about advanced optimization techniques for large-scale pattern recognition problems.
USEFUL FOR

Researchers and practitioners in computational physics, machine learning engineers focusing on pattern recognition, and anyone interested in optimizing complex spin systems using simulated annealing.

zeta
Messages
20
Reaction score
1
I am trying in vain to use simulated anneal to minimize an ising system with spin 7/2. This is a model for a pattern recognition task. The system is roughly 40^2 and the spin -7/2<I<7/2
ie., 2I+1 = 8 states per node. It's big.

The problem is that I can't work out what a thermal fluctuation corresponds to in this case or in other words how does one move between neighboring states? Take the TS problem, you simply rearrange coordinates. What's the analogous move here?
cheers
 
Physics news on Phys.org
strictly speaking this is called the Heisenberg model, b/c I>1/2
 

Similar threads

  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 6 ·
Replies
6
Views
4K
  • · Replies 15 ·
Replies
15
Views
7K
  • · Replies 3 ·
Replies
3
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
Replies
8
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K