Information om | Engelska ordet BACKTRACKING

Exempel på hur man kan använda BACKTRACKING i en mening

• As with other types of LR(1) parser, an SLR parser is quite efficient at finding the single correct bottom-up parse in a single left-to-right scan over the input stream, without guesswork or backtracking.
• This typically draws upon standard methods like chronological backtracking and constraint propagation, but may use customized code like a problem-specific branching heuristic.
• Simple implementations of top-down parsing do not terminate for left-recursive grammars, and top-down parsing with backtracking may have exponential time complexity with respect to the length of the input for ambiguous CFGs.
• Graph coloring has been studied as an algorithmic problem since the early 1970s: the chromatic number problem (see section #Vertex coloring below) is one of Karp's 21 NP-complete problems from 1972, and at approximately the same time various exponential-time algorithms were developed based on backtracking and on the deletion-contraction recurrence of.
• Originally named BackTrack (named after the homonym class of backtracking algorithms), it is developed by Offensive Security.
• Many algorithmic methods for finding graph homomorphisms, like backtracking, constraint propagation and local search, apply to all CSPs.
• Top-Down Parsing Language (TDPL) is a type of analytic formal grammar developed by Alexander Birman in the early 1970s in order to study formally the behavior of a common class of practical top-down parsers that support a limited form of backtracking.
• If the gradient of the cost function is globally Lipschitz continuous, with Lipschitz constant L, and learning rate is chosen of the order 1/L, then the standard version of SGD is a special case of backtracking line search.
• Super-linear speedups can also occur when performing backtracking in parallel: an exception in one thread can cause several other threads to backtrack early, before they reach the exception themselves.
• to pacify anti-reform forces?", Kozyrev told the Los Angeles Times, "of course, there has been some backtracking.
• Negotiations then deadlocked on the issue of the presidency, with Speight backtracking on an initial agreement for the president to be nominated by the Great Council of Chiefs and demanding instead that Ratu Josefa Iloilo be sworn in immediately.
• The algorithm's optimality can be improved by using backtracking during the search for the optimal decision tree at the cost of possibly taking longer.
• A coherent order is discovered iteratively by detecting incoherencies as they occur and backtracking their effects.
• Some archive formats like zip allow for directory traversal attacks: files in the archive can be written such that they overwrite files on the filesystem by backtracking.
• Metroidvanias usually do not consist of any linear gameplay and often involve much backtracking – especially after new powerups or tools have been obtained.
• The Farey sequence of order n may be found by an inorder traversal of the left subtree of the Stern–Brocot tree, backtracking whenever a number with denominator greater than n is reached.
• It eschews the resolution for the splitting rule: a backtracking algorithm that chooses a literal l, and then recursively checks if a simplified formula with l assigned a true value is satisfiable or if a simplified formula with l assigned false is.
• However, the main improvement has been a more powerful algorithm, Conflict-Driven Clause Learning (CDCL), which is similar to DPLL but after reaching a conflict "learns" the root causes (assignments to variables) of the conflict, and uses this information to perform non-chronological backtracking (aka backjumping) in order to avoid reaching the same conflict again.
• It is a straightforward recursive, nondeterministic, depth-first, backtracking algorithm used by Donald Knuth to demonstrate an efficient implementation called DLX, which uses the dancing links technique.
• In backtracking algorithms, look ahead is the generic term for a subprocedure that attempts to foresee the effects of choosing a branching variable to evaluate one of its values.

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