Network inference with hidden units

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2014, 11(1): 149-165. doi: 10.3934/mbe.2014.11.149

Network inference with hidden units

1.	Department of Mathematics, Stockholm University, Kräftriket, S-106 91 Stockholm, Sweden
2.	Nordita, Stockholm University and KTH, Roslagstullsbacken 23, S-106 91 Stockholm, Sweden

Received December 2012 Revised May 2013 Published September 2013

Abstract
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We derive learning rules for finding the connections between units in stochastic dynamical networks from the recorded history of a ``visible'' subset of the units. We consider two models. In both of them, the visible units are binary and stochastic. In one model the ``hidden'' units are continuous-valued, with sigmoidal activation functions, and in the other they are binary and stochastic like the visible ones. We derive exact learning rules for both cases. For the stochastic case, performing the exact calculation requires, in general, repeated summations over an number of configurations that grows exponentially with the size of the system and the data length, which is not feasible for large systems. We derive a mean field theory, based on a factorized ansatz for the distribution of hidden-unit states, which offers an attractive alternative for large systems. We present the results of some numerical calculations that illustrate key features of the two models and, for the stochastic case, the exact and approximate calculations.

Keywords: mean field theory, hidden units., Network inference, kinetic Ising models, latent variables.

Mathematics Subject Classification: Primary: 62M45, 82C20; Secondary: 62J0.

Citation: Joanna Tyrcha, John Hertz. Network inference with hidden units. Mathematical Biosciences & Engineering, 2014, 11 (1) : 149-165. doi: 10.3934/mbe.2014.11.149

References:

[1]	D. Ackley, G. E. Hinton and T. J. Sejnowski, A learning algorithm for Boltzmann machines,, Cogn. Sci., 9 (1985), 147. Google Scholar
[2]	H. Akaike, A new look at the statistical model identification. System identification and time-series analysis,, IEE Transactions on Automatic Control, AC-19 (1974), 716. Google Scholar
[3]	D. Barber, "Bayesian Reasoning and Machine Learning,", chapter 11, (2012). Google Scholar
[4]	A. P. Dempster, N. M. Laird and D. B. Rubin, Maximum likelihood from incomplete data via the EM algorithm. With discussion,, J. Roy. Stat. Soc. B, 39 (1977), 1. Google Scholar
[5]	B. Dunn and Y. Roudi, Learning and inference in a nonequilibrium Ising model with hidden nodes,, Phys. Rev. E, 87 (2013). doi: 10.1103/PhysRevE.87.022127. Google Scholar
[6]	R. J. Glauber, Time-dependent statistics of the Ising model,, J. Math. Phys., 4 (1963), 294. doi: 10.1063/1.1703954. Google Scholar
[7]	J. Hertz, Y. Roudi and J. Tyrcha, Ising models for inferring network structure from spike data,, in, (2013), 527. doi: 10.1201/b14756-31. Google Scholar
[8]	M. Mézard, G. Parisi and M. Virasoro, "Spin Glass Theory and Beyond,", chapter 2, 9 (1987). Google Scholar
[9]	B. A. Pearlmutter, Learning state space trajectories in recurrent neural networks,, Neural Computation, 1 (1989), 263. Google Scholar
[10]	P. Peretto, Collective properties of neural networks: A statistical physics approach,, Biol. Cybern., 50 (1984), 51. doi: 10.1007/BF00317939. Google Scholar
[11]	F. J. Pineda, Generalization of back-propagation to recurrent neural networks,, Phys. Rev. Lett., 59 (1987), 2229. doi: 10.1103/PhysRevLett.59.2229. Google Scholar
[12]	Y. Roudi and J. Hertz, Mean-field theory for nonequilibrium network reconstruction,, Phys. Rev. Lett., 106 (2011). doi: 10.1103/PhysRevLett.106.048702. Google Scholar
[13]	Y. Roudi, J. Tyrcha and J. Hertz, The Ising model for neural data: Model quality and approximate methods for extracting functional connectivity,, Phys. Rev. E, 79 (2009). doi: 10.1103/PhysRevE.79.051915. Google Scholar
[14]	D. E. Rumelhart, G. E. Hinton and R. J. Williams, Learning Internal Representations by Error Propagation,, in, (1986). Google Scholar
[15]	L. K. Saul, T. Jaakkola and M. I. Jordan, Mean field theory for sigmoid belief networks,, J. Art. Intel. Res., 4 (1996), 61. Google Scholar
[16]	E. Schneidman, M. J. Berry, R. Segev and W. Bialek, Weak pairwise correlations imply strongly correlated network states in a neural population,, Nature, 440 (2006), 1007. doi: 10.1038/nature04701. Google Scholar
[17]	G. E. Schwarz, Estimating the dimension of a model,, Annals of Statistics, 6 (1978), 461. doi: 10.1214/aos/1176344136. Google Scholar
[18]	R. Sundberg, Maximum likelihood theory for incomplete data from an exponential family,, Scand. J. Statistics, 1 (1974), 49. Google Scholar
[19]	D. Sherrington and S. Kirkpatrick, Solvable model of a spin-glass,, Phys. Rev. Lett., 35 (1975), 1792. doi: 10.1103/PhysRevLett.35.1792. Google Scholar
[20]	D. J. Thouless, P. W. Anderson and R. G. Palmer, Solution of "soluble model of a spin glass,'', Philos. Mag., 92 (1974), 272. Google Scholar
[21]	R. J. Williams and D. Zipser, A learning algorithm for continually running fully recurrent networks,, Neural Comp., 1 (1989), 270. doi: 10.1162/neco.1989.1.2.270. Google Scholar

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References:

[1]	D. Ackley, G. E. Hinton and T. J. Sejnowski, A learning algorithm for Boltzmann machines,, Cogn. Sci., 9 (1985), 147. Google Scholar
[2]	H. Akaike, A new look at the statistical model identification. System identification and time-series analysis,, IEE Transactions on Automatic Control, AC-19 (1974), 716. Google Scholar
[3]	D. Barber, "Bayesian Reasoning and Machine Learning,", chapter 11, (2012). Google Scholar
[4]	A. P. Dempster, N. M. Laird and D. B. Rubin, Maximum likelihood from incomplete data via the EM algorithm. With discussion,, J. Roy. Stat. Soc. B, 39 (1977), 1. Google Scholar
[5]	B. Dunn and Y. Roudi, Learning and inference in a nonequilibrium Ising model with hidden nodes,, Phys. Rev. E, 87 (2013). doi: 10.1103/PhysRevE.87.022127. Google Scholar
[6]	R. J. Glauber, Time-dependent statistics of the Ising model,, J. Math. Phys., 4 (1963), 294. doi: 10.1063/1.1703954. Google Scholar
[7]	J. Hertz, Y. Roudi and J. Tyrcha, Ising models for inferring network structure from spike data,, in, (2013), 527. doi: 10.1201/b14756-31. Google Scholar
[8]	M. Mézard, G. Parisi and M. Virasoro, "Spin Glass Theory and Beyond,", chapter 2, 9 (1987). Google Scholar
[9]	B. A. Pearlmutter, Learning state space trajectories in recurrent neural networks,, Neural Computation, 1 (1989), 263. Google Scholar
[10]	P. Peretto, Collective properties of neural networks: A statistical physics approach,, Biol. Cybern., 50 (1984), 51. doi: 10.1007/BF00317939. Google Scholar
[11]	F. J. Pineda, Generalization of back-propagation to recurrent neural networks,, Phys. Rev. Lett., 59 (1987), 2229. doi: 10.1103/PhysRevLett.59.2229. Google Scholar
[12]	Y. Roudi and J. Hertz, Mean-field theory for nonequilibrium network reconstruction,, Phys. Rev. Lett., 106 (2011). doi: 10.1103/PhysRevLett.106.048702. Google Scholar
[13]	Y. Roudi, J. Tyrcha and J. Hertz, The Ising model for neural data: Model quality and approximate methods for extracting functional connectivity,, Phys. Rev. E, 79 (2009). doi: 10.1103/PhysRevE.79.051915. Google Scholar
[14]	D. E. Rumelhart, G. E. Hinton and R. J. Williams, Learning Internal Representations by Error Propagation,, in, (1986). Google Scholar
[15]	L. K. Saul, T. Jaakkola and M. I. Jordan, Mean field theory for sigmoid belief networks,, J. Art. Intel. Res., 4 (1996), 61. Google Scholar
[16]	E. Schneidman, M. J. Berry, R. Segev and W. Bialek, Weak pairwise correlations imply strongly correlated network states in a neural population,, Nature, 440 (2006), 1007. doi: 10.1038/nature04701. Google Scholar
[17]	G. E. Schwarz, Estimating the dimension of a model,, Annals of Statistics, 6 (1978), 461. doi: 10.1214/aos/1176344136. Google Scholar
[18]	R. Sundberg, Maximum likelihood theory for incomplete data from an exponential family,, Scand. J. Statistics, 1 (1974), 49. Google Scholar
[19]	D. Sherrington and S. Kirkpatrick, Solvable model of a spin-glass,, Phys. Rev. Lett., 35 (1975), 1792. doi: 10.1103/PhysRevLett.35.1792. Google Scholar
[20]	D. J. Thouless, P. W. Anderson and R. G. Palmer, Solution of "soluble model of a spin glass,'', Philos. Mag., 92 (1974), 272. Google Scholar
[21]	R. J. Williams and D. Zipser, A learning algorithm for continually running fully recurrent networks,, Neural Comp., 1 (1989), 270. doi: 10.1162/neco.1989.1.2.270. Google Scholar

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