The phrase "according to a key" is correct and usable in written English.
It can be used when referencing a specific key or guide that provides information or clarification about something, such as a map or a set of instructions.
Example: "According to a key, the blue lines on the map indicate hiking trails."
Alternatives: "based on a key" or "as per a key".
According to a key member of Clinton's staff, it was Hillary who proposed the idea.
Inflation appeared to be active, nonetheless, according to a key Commerce Department figure.
Levels of trust in the UK government, media and businesses have plummeted, according to a key survey.
According to a key Democratic strategist, it was not McCain's rejection that angered him — he had always understood the odds were long.
"The Soviets will say the President is in a bargaining mood, or we hope they will say that," according to a key Administration official.
A decision to change the funding model for aged care which has allowed the government to save $1.2bn is a "Band-Aid over a broken system", according to a key aged-care group.
The Map function converts the input data to groups according to a key-value pair, and the Reduce function performs aggregation by key-value on the output of the Map function.
According to a key-informant, community rounds also present the opportunity for interprofessional learning which benefits the patient through triaging to avoid crisis management.
"These are not huge numbers once you distribute them by year and by country according to a distribution key," he said.
This would be funded by €50m (£36m), with Brussels effectively paying countries to take in migrants according to a distribution key based on population size, national wealth, numbers of asylum seekers already present, and unemployment levels.
Image blocks are shuffled according to a secret key before being wavelet transform, in order to achieve security and robustness against some malicious attacks.
