| 词汇 | example_english_backtrack |
| 释义 | Examples of backtrackThese examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. Section 5 introduces conflict sets and our generic search algorithm, and recasts backtracking search in that framework. The presence of the all/2 collector avoids the need for backtracking over multiple remote answers. Chapter 6 improves naive backtracking using look-back schemes for backjumping and learning. Unfortunately, the presence of non-deterministic strategies and rules limits its applicability, because backtracking requires access to structures that would otherwise be reused. The failed attempt to establish this goal in the existing plan network supports expansion, failure, or backtracking as an option. However, the system will add new preconditions rather than backtracking if an unsafe state is generated during synthesis. Still, using the trail for storing both references which have to be reset upon backtracking and inter-block references has important disadvantages. Profiling revealed that in this benchmark, upon backtracking and untrailing it is often needed to remove several cells at once from a certain remembered set. 14 again because backtracking does not remove the reason for the failure !. By contrast, backtracking automata cannot be easily analyzed. The other kind of error - incompleteness via infinite loops or backtracking failure - continues to be bothersome, of course: dependent types do not save us there. Upon backtracking the registers that held these system variables are restored from the choicepoint. If a sub-string matches the contextual restrictions, the corresponding operation applies without later backtracking. Any feature structures and definite clause programs can be used to express the constraint, which may include backtracking, cut, negation-as-failure, assertion and any other operations. In this case backtracking must take place to the most recent choice point either in clause selection or in unification. The algorithmic realization of our coloring sequences in terms of backtracking algorithms is rather straightforward. Clearly, by forcing backtracking we can enumerate all possible implementations of an n-bit key. We do this by restoring the stack pointers and backtracking to the node. All heap cells allocated since the creation of the most recent choice point can be deallocated and reused for new allocations after backtracking. If the solver backtracks across a choice that led to creation of a component, that component and its dependent variables are again removed. In this case, backtracking takes place and the designer goes back to the parent product model to explore new oppor tunities. In the outcome stage, a favorable solution is chosen, no acceptable solution is determined, or backtracking to a previous stage occurs. He then backtracks to 1834 and the real commencement of indentured labour in the following chapter : this is confusing. The two intelligent backtracking techniques we will describe are learning and restricted learning. Constructive search strategies attempt to build a solution by incrementally making commitments to variables, checking the constraints, and backtracking when violations are found. If an assignment proves inconsistent, the procedure fails, and backtracking occurs. If the algorithm reaches a dead end (where there is no valid assignment for a variable), it backtracks. Whenever the solver discovers an inconsistent state, it immediately backtracks to try a different assignment, thus avoiding the fruitless exploration of that state's extensions. If a constraint is violated, the search backtracks to explore the next possible assignment of the current variable. The first strike lasted 80 days and won some concessions, but when the government appeared to be backtracking, a second strike was called in 1979. However, the resulting parsers may accept different languages according to the specific grammar and amount of backtracking provided by the combinators. The abstraction of the backtracking control structure and the identification of its functional parameters have allowed us to emphasize their implementation in other programming paradigms. In our opinion, designers that wish to adopt backtracking automata should not be prevented to do so by the question of pattern matching diagnostics. Completion can thus be performed when we are the last worker backtracking to the generalized leader nodes, and there is no more work below. The purpose is to create a problem that is sufficiently difficult so that enhancing the program with intelligent backtracking pays off. If not, my assign/4 fails and backtracking returns to the previous assignment. Each time backtracking occurs, all data allocated since the creation of the most recent choice point can be deallocated. Upon backtracking to a certain choice point, all bindings done since the creation of that choice point need to be undone. Upon backtracking and instant reclaiming, it would be easy to remove the appropriate inter-block references. The solution algorithm is based on backtracking search. We assume a depth-first approach with the possibility of backtracking in the treatment of the first three aspects. The unlabelling method of dynamic backtracking keeping formerly detected and still valid elimination explanations. The alternative unlabelling method of a variant of dynamic backtracking deleting additional variable assignments also keeping formerly detected and still valid elimination explanations. When a contradiction is raised (for instance, by rule propagation), it is caught by the branch(...) instruction, which backtracks and returns false. The search backtracks when the current solution is found to be an inconsistent partial assignment - an assignment to some portion of the variables which directly contradicts some constraint. In backtracking automata, each of the actions of every pattern appears only once, but on the other hand, there is no sharing of similar actions across different patterns. Strong computational synthesis further introduces a heuristic element for managing the search process; weak computational synthesis responds to poor design performance by backtracking within and across abstraction levels. An inadequate solving strategy will lead to a large number of backtracking operations that were preceded by wasted propagation effor t and cost much solving time. One backtracks whenever a feasible solution is found, or it can be determined that no solution of the current strengthening is feasible in the original problem. Upon backtracking only the earliest trailing after the choice-point is important, since that is the one which enables the reconstruction of the state of the variable before the choice-point. If the solver manages to reach a complete state without encountering an inconsistency, it records a solution; if multiple solutions are wanted, it backtracks to find the others. There will be a lot of backtracking on encountering dead-ends, but one of the advantages of lazy functional programming is that we don't have to program the backtracking ourselves. We have omitted it here because def to eqclause is only be used in our proof checker, which is written to avoid the need for backtracking. Smodels recognizes that and backtracks immediately. Upon backtracking all heap cells allocated after the creation of the most recent choice point (all heap cells belonging to the topmost heap segment) can be deallocated easily. At the moment we seem to be backtracking as much as moving forward. From Europarl Parallel Corpus - English Just as he has backtracked on decentralisation and independence, we shall see how he votes then. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 The proposal for the careers services backtracks on that. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 As he knows very well, there is no backtracking but an absolute commitment to maximising the benefits of the efficiency review to front-line services. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 I have by no means backtracked on the question of nephrops. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 Who will trust leadership which says one thing and does another; which agrees policies, but then backtracks, disrupts and weakens their implementation? From Europarl Parallel Corpus - English However, there are wide concerns that any backtracking from the model could be greatly detrimental to the 16 to 18-year-old students. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 There has been nothing but a great deal of backtracking and vacillation on the part of the department. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 The whole story is a sorry one of constant backtracking and indecision. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 There has been some backtracking, but little forward explanation. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 Now he is, as always, backtracking on this very point. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 We seem to be backtracking rather than improving. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 They have backtracked on a very long tradition—another tradition of importance in the industry and elsewhere. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 I hope that this will not be seen as backtracking or sinister motives, but as a genuine attempt to get that balance right. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 Why has she subsequently backtracked on that public commitment? From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 There already appears to have been some backtracking. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 We take some comfort from this backtracking but not much. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 Firstly, to ensure there is no backtracking on political prisoners and politically motivated criminal prosecution. From Europarl Parallel Corpus - English I will be happy, of course, if it is merely media spin without substance that has suggested backtracking on that target. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 They are alarmed that the health authority is backtracking on its promise to build the unit as part of developments at the hospital. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 If a private operator backtracks upon his supposed obligations under the local authority scheme, what kind of policing is there to be? From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 When this profitless exercise of backtracking is over, the main problem of the industry will still remain. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 I am a bit worried that there is already evidence of backtracking. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 There is more and more backtracking into previous legislation, and with that the opportuniity for error grows. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 Will he explain why, within the past few weeks, he has backtracked on his previous intention to reduce the mesh size for nephrops to 70mm? From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 From a political point of view, this amounts to backtracking from that hard won compromise. From Europarl Parallel Corpus - English I apologise for backtracking on one point, so to speak. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 They have been backtracking on investment money and playing yo-yo with interest rates. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 He said that the people should be the appointments commission, but then backtracked again. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 Privatisation seems to be an opportunity for backtracking on existing pollution controls, even though those are inadequate. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 At least, that was the position until some point this afternoon, when a county policy meeting occurred and the council backtracked somewhat on its earlier proposal. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 Once again he backtracks and assumes a larger unity in which conflict takes place. Should the path fail then the system backtracks to the previous decision point and takes a different path. The search backtracks if it reaches an inconsistent partial assignment and succeeds if it finds a satisfying assignment. Chapter 7 completes the basic section with stochastic greedy local search as a complement to backtracking search. Since there is no problem upon backtracking to a collected choice point, there is no need to remove the related remembered set entries. Consequently, there is no need to scan the remembered sets after untrailing, when backtracking did not recover any heap space. Backtracking points were represented by pointers into this list, and backtracking to remove bindings involved discarding the list down to the pointer. Therefore, homology is a useful trait to search for, and one that can be handled by backtracking along paths. A sequential algorithm for this problem can be produced by simulating the non-determinism by backtracking. In that case, the program goes into costly backtracking operations. Traces that are recorded do not include backtracking information. If this is the first time that backtracking from that consumer node takes place, then it is performed as usual. The trail stack stores updates that must be undone upon backtracking. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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