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Interaction Networks for Learning about Objects, Relations and Physics

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Ken Kuroki

For my presentation for a reading group. I have not in any way contributed this study, which is done by the researchers named on the first slide. https://papers.nips.cc/paper/6418-interaction-networks-for-learning-about-objects-relations-and-physics

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Interaction Networks for Learning about Objects, Relations and Physics Peter Battaglia, Razvan Pascanu, Matthew Lai, Danilo Jimenez Rezende, koray kavukcuoglu (Google DeepMind) NIPS 2016 Reading Club
 Presenter: Ken Kuroki (@enuroi) 1
Background & Purpose • Some attempts to learn physical dynamics so far.
 (rigid bodies, fluid dynamics, 3D trajectory etc.) • This study aims to construct a general-purpose learnable physics engine.
 (that can learn novel physical systems) 2
Model at a Glance 3 O1 O2 O1,t O2,t r fR et+1 O2,t fO et+1 O2,t+1
Model in Detail 1 4 Rr = 0 0 1 1 0 0 Rs = 1 0 0 0 0 1
Model in Detail 2 5 NR : number of relations NO : number of objects bk : <oi, oj, rk>
 (rearranges the objects and relations into interaction terms) Relation
 e: multiple for one object c: aggregated by a
Implementation 1 6 O = Ds NO R = NR NO NR NO Rr Rs receiver sender DR NR Ra attributes , , object1's status vector
Implementation 2 7 m(G) = Ds Ds DR NR ORr ORs Ra = B [b1, b2, ..., bk] [e1, e2, ..., ek] = E fR
Implementation 3 8 G, X, E E = ERr – T [O; X; E] = C – Ds Ds DR NR O X E – fR a P = Ot+1 DA fA (Free energy)
Architecture • MLP (bias, ReLU) By hyperparamerter search... • FR : four 150-length hidden layers, output length 50 • FO : one 100-length hidden layer, output length 2
 (x and y velocity) • FA : one 25-length hidden layer 9
Optimization • Used Adam
 Learning rate 0.001, and downscaled by *0.8 for 40 epochs • L2 regularization
 (penalty factor by grid search) 10
Training Simulated 2000 scenes over 1000 time steps • Training : 1 million sample, for 2000 epochs (mini- batches of 100 to balance distributions) • Validation : 200k sample • Test data : 200k sample 11
Experiments 1. N-body 2. Bouncing balls 3. String 12
Comparison Alternative Models: 1. Constant velocity (output=input) 2. MLP (two 300-length hidden layers)
 input: flattened vector of all the input data 3. Interaction Network without E (interaction) 13
Results 14
Discussion 1. Performed better than alternatives 2. Baseline MLP couldn't effectively learn interaction 3. To understand "intuitive physics engine" in human 4. Potential to expand the model 15
Presenter's Comments 1. Can be applied to a larger system?
 (time & memory-wise) 2. Probably it can be parallelized 3. Really advantageous to alternatives? 16

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Interaction Networks for Learning about Objects, Relations and Physics

  • 1. Interaction Networks for Learning about Objects, Relations and Physics Peter Battaglia, Razvan Pascanu, Matthew Lai, Danilo Jimenez Rezende, koray kavukcuoglu (Google DeepMind) NIPS 2016 Reading Club
 Presenter: Ken Kuroki (@enuroi) 1
  • 2. Background & Purpose • Some attempts to learn physical dynamics so far.
 (rigid bodies, fluid dynamics, 3D trajectory etc.) • This study aims to construct a general-purpose learnable physics engine.
 (that can learn novel physical systems) 2
  • 3. Model at a Glance 3 O1 O2 O1,t O2,t r fR et+1 O2,t fO et+1 O2,t+1
  • 4. Model in Detail 1 4 Rr = 0 0 1 1 0 0 Rs = 1 0 0 0 0 1
  • 5. Model in Detail 2 5 NR : number of relations NO : number of objects bk : <oi, oj, rk>
 (rearranges the objects and relations into interaction terms) Relation
 e: multiple for one object c: aggregated by a
  • 6. Implementation 1 6 O = Ds NO R = NR NO NR NO Rr Rs receiver sender DR NR Ra attributes , , object1's status vector
  • 7. Implementation 2 7 m(G) = Ds Ds DR NR ORr ORs Ra = B [b1, b2, ..., bk] [e1, e2, ..., ek] = E fR
  • 8. Implementation 3 8 G, X, E E = ERr – T [O; X; E] = C – Ds Ds DR NR O X E – fR a P = Ot+1 DA fA (Free energy)
  • 9. Architecture • MLP (bias, ReLU) By hyperparamerter search... • FR : four 150-length hidden layers, output length 50 • FO : one 100-length hidden layer, output length 2
 (x and y velocity) • FA : one 25-length hidden layer 9
  • 10. Optimization • Used Adam
 Learning rate 0.001, and downscaled by *0.8 for 40 epochs • L2 regularization
 (penalty factor by grid search) 10
  • 11. Training Simulated 2000 scenes over 1000 time steps • Training : 1 million sample, for 2000 epochs (mini- batches of 100 to balance distributions) • Validation : 200k sample • Test data : 200k sample 11
  • 12. Experiments 1. N-body 2. Bouncing balls 3. String 12
  • 13. Comparison Alternative Models: 1. Constant velocity (output=input) 2. MLP (two 300-length hidden layers)
 input: flattened vector of all the input data 3. Interaction Network without E (interaction) 13
  • 15. Discussion 1. Performed better than alternatives 2. Baseline MLP couldn't effectively learn interaction 3. To understand "intuitive physics engine" in human 4. Potential to expand the model 15
  • 16. Presenter's Comments 1. Can be applied to a larger system?
 (time & memory-wise) 2. Probably it can be parallelized 3. Really advantageous to alternatives? 16