Funding Sources and Revenues
While most progressive think tanks acquire their funding through many different sources, for conservative think tanks financing by corporations prevails. Among the think tanks receiving a considerable amount of corporate money are the Cato Institute (U.S. conservative/libertarian), the Brookings Institution (U.S. centrist), the Heritage Foundation (U.S. conservative), the American Enterprise Institute (U.S. conservative) and the  Competitive Enterprise Institute (U.S. conservative).
Also, whereas the combined revenue base of such conservative multi-issue policy institutions as the Heritage Foundation, the American Enterprise Institute, Free Congress Research and Education Foundation, the Cato Institute, and Citizens for a Sound Economy exceeded US$ 77 million in 1995, the roughly equivalent U.S. progressive Institute for Policy Studies, the Economic Policy Institute, Citizens for Tax Justice, and the Center for Budget and Policy Priorities had only US$ 9 million at their collective disposal in 1995.
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Neural network
A bottom-up artificial intelligence approach, a neural network is a network of many very simple processors ("units" or "neurons"), each possibly having a (small amount of) local memory. The units are connected by unidirectional communication channels ("connections"), which carry numeric data. The units operate only on their local data and on the inputs they receive via the connections. A neural network is a processing device, either an algorithm, or actual hardware, whose design was inspired by the design and functioning of animal brains and components thereof. Most neural networks have some sort of "training" rule whereby the weights of connections are adjusted on the basis of presented patterns. In other words, neural networks "learn" from examples and exhibit some structural capability for generalization.
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