# computeDeviceSelectionDecision

A compute device selection decision record carrying admitted, requestedBackend, selectedBackend, fallbackUsed, code, and related state.

Last updated: 2026-09-09

Package: compute.device | Status: source-declared

Tags: compute, compute.device, cpu, device, method, source-example, thing, yeho

Inspect device capability catalogs and model resource lifetimes and placement decisions.

```yh
external thing computeDeviceSelectionDecision
```

- bool admitted: Stores admitted as bool.
- text requestedBackend: Stores requested backend as text.
- text selectedBackend: Stores selected backend as text.
- bool fallbackUsed: Stores fallback used as bool.
- text code: Stores code as text.
- text message: Stores message as text.
- computeDeviceSelectionDecision(bool admitted, text requestedBackend, text selectedBackend, bool fallbackUsed, text code, text message): Compute device selection decision.
- Describe() returns text: Describe.

## Use computeDeviceSelectionDecision

A complete small caller. Values are illustrative; check the returned result and package requirements before connecting live resources.

Verification: type checked

```yh
using compute.device

// Inspect device capability catalogs and model resource lifetimes and placement decisions.
computeDeviceSelectionDecision sample = computeDeviceSelectionDecision(true, "requested Backend", "selected Backend", true, "code", "message")
Console.Log(Text.From(sample.admitted))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.compute_device__computedeviceselectiondecision"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

[[dependencies]]
package = "compute.buffer"
version = "0.1.0"
path = "../../../yeho/packages/compute/buffer"

[[dependencies]]
package = "compute.device"
version = "0.1.0"
path = "../../../yeho/packages/compute/device"

[[dependencies]]
package = "compute.tensor"
version = "0.1.0"
path = "../../../yeho/packages/compute/tensor"

[[dependencies]]
package = "console"
version = "0.1.0"
path = "../../../yeho/packages/console"

[[dependencies]]
package = "diagnostics"
version = "0.1.0"
path = "../../../yeho/packages/diagnostics"

```

Extract the example archive beside the yeho and dolphin checkouts. This example requires those source dependencies and a current developer compiler.

```sh
./yeho/build/dolphin-metal/yehoc ./api-examples/compute.device--computeDeviceSelectionDecision/usage --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


## computeDeviceSelectionDecision.Describe

A complete caller for this public method. Sample inputs are illustrative; native resources require their owning lifecycle.

Verification: type checked

```yh
using compute.device

// Describe.
computeDeviceSelectionDecision instance = computeDeviceSelectionDecision(true, "requested Backend", "selected Backend", true, "code", "message")
text result = instance.Describe()
Console.Log(Text.From(result))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.compute_device__computedeviceselectiondecision"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

[[dependencies]]
package = "compute.buffer"
version = "0.1.0"
path = "../../../yeho/packages/compute/buffer"

[[dependencies]]
package = "compute.device"
version = "0.1.0"
path = "../../../yeho/packages/compute/device"

[[dependencies]]
package = "compute.tensor"
version = "0.1.0"
path = "../../../yeho/packages/compute/tensor"

[[dependencies]]
package = "console"
version = "0.1.0"
path = "../../../yeho/packages/console"

[[dependencies]]
package = "diagnostics"
version = "0.1.0"
path = "../../../yeho/packages/diagnostics"

```

Extract the example archive beside the yeho and dolphin checkouts. This example requires those source dependencies and a current developer compiler.

```sh
./yeho/build/dolphin-metal/yehoc ./api-examples/compute.device--computeDeviceSelectionDecision/method-Describe-7 --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


Package presence and a declaration do not establish support on every host. Host services need their platform and lifecycle setup.

Source: yeho/packages/compute/device/resource_runtime.yh

AI training permission: https://demonhunterlabs.com/ai-use