What's new? 13 Apr 2021
AIDD project on machine learning in chemistry: PhD position in collaboration with Bayer. See recruitment site and follow instructions for ESR 12.
Many jobs for PhD students and PostDocs
to be hired in 2020.
Earlier jobs: 2018, 2017,
FAQ in AMA (Ask Me Anything) on
Old videos (2009-2015)
Master's in Artificial Intelligence (Fall 2017)
Polo universitario Lugano, Via la Santa 1,
CH-6962 Lugano - Viganello,
Fax +41 58 666666 1
Fon +41 58 666666 2
Sec +41 58 666666 6
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Pronounce: You_again Shmidhoobuh (if you can say
then you can also say
ON THE NET SINCE 1405
Scientific Director of IDSIA,
Prof. of AI @ USI,
ex-head of Cog Bot Lab
Dr. rer. nat. habil. 1993 @ CU,
Dr. rer. nat. 1991,
Dipl. Inf. 1987
Curriculum Vitae (2020)
Photos: Talk at Geneva Motor Show 2019:
Talk in Football Stadium 2019:
WEF, Davos (2018):
National Geographic (2017):
more pics (1963-2007)
RESEARCH TOPICS (more in the columns to the right):
Feedback Neural Networks,
Deep Learning &
Computer Vision &
Pattern Recognition (numerous world records on benchmark datasets, first
superhuman results), award-winning
Optimal Problem Solvers,
Reinforcement learning (RL),
Meta-Learning & Recursive Self- Improvement,
Artificial Curiosity & Creativity & Intrinsic Motivation & Developmental Robotics, Formal Theory of Fun & Creativity,
Theory of Beauty,
Generalized Algorithmic Information
Machine Learning 1
Machine Learning 2
Pybrain Machine Learning
Library features source code of many
new learning algorithms that cannot be found in other
libraries - see Pybrain video
Robot Population Explosion,
Resilient Robots (Science 316 p 688),
Cogbotlab (compare LRZ 2005),
IDSIA Robotics Lab,
at the EXPO21xx show room
Example: Femme Fractale
3D Art (sculpture),
Lego Art: stable rings from LEGO bricks,
art involving JS' kids,
pics of self-improving robots:
state of the art /
the future / the far future
Is history converging? Again? (2006)
Computer history speedup &
Schmidhuber's law: each new breakthrough
comes twice as fast - Omega point around 2040;
TEDx talk +
The New AI as a formal science.
Raw computing power.
Colossus (Nature 441 p 25),
Telephone (Science 319 p 1759),
First Pow(d)ered Flight (Nature 421 p 689)
MEN who left their mark:
Einstein (general relativity, 1915),
Zuse (first computer, 1935-41),
Goedel (limits of math and computation, 1931),
Turing (Turing machine, 1936: Nature
429 p 501),
Gauss (mathematician of the millennium),
Leibniz (inventor of the bit),
Schickard (father of the computer age),
Solomonoff (theory of optimal prediction),
Darwin (Nature 452 p 530),
Haber & Bosch (1913:
most influential invention of the 20th century),
Archimedes (greatest scientist ever?)
NOBEL PRIZES: Evolution of national shares
by country of birth (by citizenship):
English & German
London Olympics 2012: EU gold medal count,
Beijing 2008 gold count,
EU metal of Athens 2004,
All Time Gold Medal Counts
China and former empires (letters in Newsweek, 2004-05).
The European Union - A New Kind of Empire? (2009)
Ulrike Krommer (wife)
Julia & Leonie (kids)
little brother Christof,
a theoretical physicist turned finance guru (see interview).
His papers: most
most readable /
Prof. Beliakova, a topologist.
Closest brush with fame (1981),
(perfect rhyme on 8x4 syllables, and even makes sense, 1990),
Deutsch (rarely updated)
Since age 15 or so, the main goal of professor Jürgen Schmidhuber has been to build a self-improving Artificial Intelligence (AI) smarter than himself, then retire.
His lab's Deep Learning Neural Networks
based on ideas published in the
"Annus Mirabilis" 1990-1991
have revolutionised machine learning and AI.
By the mid 2010s,
on 3 billion devices,
and used billions of times per day
through users of the world's most valuable public companies, e.g., for greatly improved
(CTC-LSTM-based) speech recognition on all Android phones, greatly improved machine translation through Google Translate and Facebook (over 4 billion LSTM-based translations per day), Apple's Siri and Quicktype on all iPhones, the answers of Amazon's Alexa, and numerous other applications.
In 2011, his team was the first to win official
computer vision contests through deep neural nets,
In 2012, they had the
first deep NN to win a medical imaging contest (on cancer detection).
All of this attracted enormous interest from industry.
His research group also established the fields of
mathematically rigorous universal AI and recursive self-improvement in metalearning machines that learn to learn (since 1987). In 1990, he introduced
unsupervised adversarial neural networks that fight each other in a minimax game to achieve artificial curiosity (GANs are a special case).
In 1991, he introduced
very deep learning through unsupervised pre-training,
neural fast weight programmers
formally equivalent to what's now called linear Transformers.
His formal theory of creativity & curiosity & fun explains art, science, music, and humor.
He also generalized algorithmic information theory and the many-worlds theory of physics, and introduced the concept of Low-Complexity Art, the information age's extreme form of minimal art.
He is recipient of numerous awards,
author of over 350 peer-reviewed papers,
and Chief Scientist of the company NNAISENSE, which aims at building the first practical general purpose AI.
He is a frequent keynote speaker, and advising various governments on AI strategies.
Artificial Recurrent Neural Networks
Most work in machine learning focuses on machines
behavior. RNNs, however, are more general sequence processors
inspired by human brains. They have adaptive
feedback connections and are
in principle as powerful as any computer.
The first RNNs could not learn to look far
back into the past. But our "Long Short-Term
Memory" (LSTM) RNN overcomes this
and efficiently learns to solve many previously unlearnable tasks.
It can be used for
speech recognition, time series prediction, music composition, etc.
our LSTM RNNs became the first recurrent Deep Learning
systems to win official international competitions (with secret test set
known only to the organisers) - they
outperformed all other known methods on the difficult
problem of recognizing unsegmented cursive handwriting,
and also on aspects of speech recognition.
They learn through
gradient descent and / or
evolution or both.
Compare the RNN Book Preface.
LSTM has become popular:
Google, Apple, Microsoft, Facebook, IBM, Baidu, and many other companies
used LSTM RNNs to improve large vocabulary speech recognition, machine translation, language identification / time series prediction / text-to-speech synthesis, etc.
Deep Learning & Computer Vision with
Fast Deep Neural Nets.
The future of search engines and robotics lies in image and video recognition.
Since 2009, our
Deep Learning team has won 9 (nine) first prizes
and highly competitive international contests
(with secret test sets known only
to the organisers), far more than any other team.
Our neural nets also set
numerous world records, and were
first Deep Learners to win pattern recognition contests in general (2009),
first to win object detection contests (2012),
first to win a pure image segmentation contest (2012),
and the first machine learning methods to reach
superhuman visual recognition performance in a contest (2011).
Google Tech Talk (2011)
and JS' first Deep Learning system of 1991,
with a Deep Learning timeline 1962-2013.
See also the
history of computer vision contests won by deep CNNs on GPU since 2011. And check out the amazing
Highway Networks (2015), the deepest of them all.
An old dream of computer scientists is to build an optimally
efficient universal problem solver. The
can be implemented on a traditional computer and solves
any given computational problem in an optimal fashion inspired by Kurt
Gödel's celebrated self-referential formulas (1931).
It starts with an axiomatic description of itself,
and we may plug in any utility function, such as the expected
future reward of a robot.
Using an efficient proof searcher,
the Gödel machine will rewrite any part of its software
(including the proof searcher)
as soon as it has found
a proof that this will improve its future performance,
given the utility function and the typically limited computational resources.
Self-rewrites are globally optimal (no local maxima!) since provably none
of all the alternative rewrites and proofs (those that could be found by
continuing the proof search) are worth waiting for.
The Gödel machine formalizes I. J. Good's informal remarks (1965) on
an "intelligence explosion" through self-improving "super-intelligences".
Optimal Ordered Problem Solver.
OOPS solves one task after another, through search for
solution- computing programs. The incremental method optimally
exploits solutions to earlier tasks when possible - compare principles
of Levin's optimal universal search.
OOPS can temporarily rewrite its own search procedure, efficiently
searching for faster search methods (metasearching or
It is applicable to problems of optimization or prediction.
Super Omegas and Generalized Kolmogorov Complexity and
Kolmogorov's (left) complexity K(x) of a bitstring x is the length of the
shortest program that computes x and halts. Solomonoff's
algorithmic probability of x is the probability of guessing
a program for x. Chaitin's Omega is the halting probability
of a Turing machine with random input (Omega is known as
the "number of wisdom" because it compactly encodes all mathematical truth).
all of this
to non-halting but converging programs. This led to
the shortest possible formal descriptions and to non-enumerable but limit-computable
measures and Super Omegas, and even has consequences for computable universes and
optimal inductive inference. Slides.
Universal Learning Algorithms.
There is a theoretically optimal way of
predicting the future, given the past.
It can be used to define an optimal (though
rational agent that maximizes
its expected reward in almost arbitrary environments sampled
from computable probability distributions.
This work represents the first mathematically
sound theory of universal artificial intelligence - most
previous work on AI was either heuristic or very limited.
Occam's Razor: prefer simple solutions to complex ones.
But what exactly does "simple" mean? According to tradition something
is simple if it has a short description or program, that is,
it has low Kolmogorov complexity.
This leads to Solomonoff's & Levin's miraculous
probability measure which yields optimal though noncomputable predictions,
given past observations. The Speed Prior
is different though: it is a new simplicity measure based on
the fastest way of describing objects, not the shortest.
Unlike the traditional one, it leads to near-optimal computable predictions,
and provokes unusual prophecies concerning the future of our universe.
In the Beginning was the Code.
In 1996 Schmidhuber wrote the first paper
about all possible computable universes. His
is consistent with Zuse's
thesis (1967) of computable physics, against which there is no
physical evidence, contrary to common belief. If everything is computable, then
which exactly is our universe's program? It turns out that the simplest program
computes all universes,
not just ours. Later work (2000) on
Algorithmic Theories of Everything analyzed all the
universes with limit-computable probabilities as well as the very
limits of formal describability. This paper led to above-mentioned
generalizations of algorithmic information and
probability and Super Omegas as well as the
See comments on Wolfram's 2002 book
on randomness in physics (Nature 439, 2006).
Some hardwired robots achieve impressive feats.
But they do not learn like babies do.
reinforcement learning algorithms
are limited to simple reactive behavior and do not
work well for realistic robots.
Hence robot learning requires novel methods for
learning to identify important past events and memorize them until needed.
Our group is focusing on the above-mentioned
recurrent neural networks,
Compressed Network Search,
and policy gradients.
with UniBW on robot cars,
with TUM-AM on
humanoids learning to walk,
with DLR on artificial hands.
New IDSIA projects
on developmental robotics
with curious adaptive humanoids
have started in 2009. See
AAAI 2013 Best Student Video.
Our most lucrative neural network application
employs a second-order method
for finding the simplest model of stock market training data.
Learning attentive vision.
Humans and other biological systems use sequential gaze shifts for
pattern recognition. This can be much more efficient than
fully parallel approaches to vision. In 1990 we built an
artificial fovea controlled by an adaptive neural controller. Without
a teacher, it learns to find targets
in a visual scene, and to track moving targets.
State-of-the-art methods for network evolution
neurons in parallel (excellent results in various
outperforms previous methods on several
supervised learning tasks, and yields
the first recurrent support vector machines.
incremental program evolution evolves
computer programs through probabilistic templates instead
of program populations (first approach to evolving entire
soccer team strategies from scratch).
As an undergrad Schmidhuber also implemented the first
genetic programming system with
loops and variable length code (1987, see below).
Our novel Natural Evolution Strategies (2008-) yield excellent
results and link
policy gradients to evolution. And
while most previous algorithms can evolve only hundreds of
adaptive parameters, but not millions, our
Compressed Network Search
(1995-) finds compact descriptions of huge networks. A 2013 variant was the first method to evolve neural network controllers with over a million weights.
Compare work on learning to think.
Interestingness & Active Exploration & Artificial Curiosity & Theory of Surprise
curious learning agents
like to go where they
expect to learn
something. These rudimentary
artificial scientists or artists
are driven by intrinsic motivation,
losing interest in both predictable and unpredictable things.
A basis for much of the recent work in Developmental Robotics since 2004.
According to Schmidhuber's formal theory of creativity,
art and science and humor are just
by-products of the desire to create / discover more data that is
predictable or compressible in hitherto unknown ways!
See Singularity Summit talk (2009).
in partially observable worlds.
Just like humans, reinforcement learners are supposed to
maximize expected pleasure and
minimize expected pain. Most traditional work is limited to
reactive mappings from sensory inputs to actions.
Our approaches (1989-2003) for
partially observable environments
are more general: they learn how to use memory and internal states,
sometimes through evolution of RNN.
The first universal reinforcement learner
is optimal if we ignore computation time,
is one that is optimal if we don't.
The novel Natural Evolution Strategies (2008-) link
policy gradients to evolution. See also
Compressed Network Search.
Unsupervised learning; non-linear ICA; history compression.
Pattern recognition works better on non-redundant
data with independent components. Schmidhuber's
(1992) was the first non-linear neural algorithm for learning to encode
redundant inputs in this way. It is based on co-evolution of
unsupervised adversarial neural networks that fight each other in a minimax game.
(1991) compactly encode sequential data for
Lococode unifies regularization
and unsupervised learning. The feature detectors generated
by such unsupervised methods resemble those of
our more recent supervised neural computer vision systems.
Metalearning Machines / Learning to Learn / Recursive Self- Improvement.
Can we construct metalearning algorithms that learn better
learning algorithms? This question has been a main drive of
Schmidhuber's research since his 1987
In 1993 he introduced
self-referential weight matrices, and in
1994 self-modifying policies trained by the
(talk slides). His first bias-optimal metalearner
was the above-mentioned
Optimal Ordered Problem Solver (2002),
and the ultimate metalearner is the
Gödel machine (2003).
See also work on "learning to think."
Automatic Subgoal Generators and Hierarchical Learning.
There is no teacher providing useful intermediate subgoals
for our reinforcement learning systems. In the early 1990s
adaptive subgoal generators; in 1997 also
Program Evolution and Genetic Programming.
As an undergrad Schmidhuber used Genetic Algorithms
programs on a Symbolics LISP machine at
Two years later this was still novel: In 1987 he published
world's 2nd paper
on pure Genetic Programming
(the first was Cramer's in 1985)
and the first paper on Meta-Genetic
with Credit Conservation.
In the late 1980s Schmidhuber developed the first credit-conserving
reinforcement learning system based on market
principles, and also the
first neural one.
Neural Heat Exchanger.
Like a physical heat exchanger,
but with neurons instead of liquid.
Perceptions warm up, expectations cool down.
Fast weights instead of recurrent nets.
A slowly changing feedforward neural net learns to quickly
manipulate short-term memory
in quickly changing synapses of
another net. More on fast weights.
Evolution of fast weight control.
Complexity-Based Theory of Beauty.
In 1997 Schmidhuber claimed: among several patterns classified as "comparable"
by some subjective observer, the subjectively most beautiful
is the one with the simplest description, given the
observer's particular method for encoding and memorizing it.
Exemplary applications include
and Low-Complexity Art,
the computer-age equivalent of minimal art (Leonardo, 1997).
A low-complexity artwork such as this Femme Fractale both
`looks right' and is computable
by a short program; a typical observer should be
able to see its simplicity. The drive to
create such art is explained by the
formal theory of creativity.
Artificial Ants & Swarm Intelligence.
IDSIA's Artificial Ant Algorithms are multiagent
optimizers that use local search techniques
and communicate via artificial
pheromones that evaporate over time. They broke several important
benchmark world records. This work got numerous
reviews in journals such as
Nature, Science, Scientific American, TIME,
NY Times, Spiegel, Economist, etc. It led to an IDSIA
spin-off company called
See also the
AAAI 2011 best video on swarmbots.
All cartoons & artwork &
Fibonacci web design
copyright © by Jürgen Schmidhuber
(except when indicated otherwise).
Image below taken from an interview for
Deutsche Bank during the 2019 World Economic Forum in Davos.