词汇 | subtree |
释义 | BETA Examples of subtreesubtree isn’t in the Cambridge Dictionary yet. You can help! The subtree depth in the base line subtree set was not constrained (though no subtrees deeper than 14 were in this base line set). This resulted in a total set of 5,217,529 subtrees which we will call the "base line subtree set". We can make precise the notion of an arithmetic binary subtree in this terminology. The running time of size is dominated by the calls to diff, one for each left subtree along the right spine. But this subtree only accounts for 156 classifications (out of 7039). It is rather a pointer to the arc linking the designated subtree to the surrouding context. Indices link the rules to the original subtrees so as to maintain the subtree's internal structure and probability. In both cases, the shortened derivation is a proper subtree of the original one. This is equivalent to saying that one subtree must never be more than a fixed amount higher than its sibling. Typically, the resulting tree is substantially overfitting the data, and we would like to select a subtree that is less complex. Each subtree has an extent-an envelope around the subtree. Permutations with a common prefix share the same subtree, hence the number of choices in each node is limited by the number of permutable elements. By pruning the tree, such a subtree is deleted. Even if most of the subtree is eventually pruned, its transient memory requirements can be exponentially large. If the estimated error at a node is smaller than its subtree, then that node is pruned. If this subtree does not contain a solution, it backtracks to the right successor state. In the long normal form, every subtree whose type is a function type has a bound variable for each of its argument types. |
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