# graphFallbackPolicy

A graph fallback policy record carrying primaryPath, fallbackPath, reason, exactShapeRequired, cacheInvalidatedOnFallback, and related state.

Last updated: 2026-09-09

Package: compute.graph | Status: source-declared

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

Describe compute work as an explicit graph with package-owned validation and scheduling metadata.

```yh
external thing graphFallbackPolicy
```

- text primaryPath: Stores primary path as text.
- text fallbackPath: Stores fallback path as text.
- text reason: Stores reason as text.
- bool exactShapeRequired: Stores exact shape required as bool.
- bool cacheInvalidatedOnFallback: Stores cache invalidated on fallback as bool.
- text note: Stores note as text.
- graphFallbackPolicy(text primaryPath, text fallbackPath, text reason, bool exactShapeRequired, bool cacheInvalidatedOnFallback, text note): Graph fallback policy.
- HasFallback() returns bool: Has fallback.
- Describe() returns text: Describe.

## Use graphFallbackPolicy

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

Verification: type checked

```yh
using compute.graph

// Describe compute work as an explicit graph with package-owned validation and scheduling metadata.
graphFallbackPolicy sample = graphFallbackPolicy("primary Path", "fallback Path", "reason", true, true, "note")
Console.Log(Text.From(sample.primaryPath))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.compute_graph__graphfallbackpolicy"
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.graph"
version = "0.1.0"
path = "../../../yeho/packages/compute/graph"

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

[[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.graph--graphFallbackPolicy/usage --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


## graphFallbackPolicy.HasFallback

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

Verification: type checked

```yh
using compute.graph

// Has fallback.
graphFallbackPolicy instance = graphFallbackPolicy("primary Path", "fallback Path", "reason", true, true, "note")
bool result = instance.HasFallback()
Console.Log(Text.From(result))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.compute_graph__graphfallbackpolicy"
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.graph"
version = "0.1.0"
path = "../../../yeho/packages/compute/graph"

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

[[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.graph--graphFallbackPolicy/method-HasFallback-7 --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


## graphFallbackPolicy.Describe

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

Verification: type checked

```yh
using compute.graph

// Describe.
graphFallbackPolicy instance = graphFallbackPolicy("primary Path", "fallback Path", "reason", true, true, "note")
text result = instance.Describe()
Console.Log(Text.From(result))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.compute_graph__graphfallbackpolicy"
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.graph"
version = "0.1.0"
path = "../../../yeho/packages/compute/graph"

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

[[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.graph--graphFallbackPolicy/method-Describe-8 --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/graph/graph.yh

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