# zkML Inference

zkML inference represents running inference on an AI or ML model in Vanna's decentralized filestore, where a [ZK-SNARK](https://z.cash/learn/what-are-zk-snarks/) will also be generated and validated by the nodes on the Vanna Network. The proof will be available on the data availability layer, which can be queried through our inference transaction explorer.

In order to run zkML inference, you need to implement the ArbInference interface for inferCallZK.

**model** - The IPFS CID for the model

**input** - The input parameters to the inference request

{% code overflow="wrap" %}

```solidity
function inferCallZK(bytes memory model, bytes memory input) external returns (bytes memory);
```

{% endcode %}

Below is an example of a minimal smart contract that runs zkML inference:

{% code title="ArbInference.sol" %}

```solidity
pragma solidity >=0.4.21 <0.9.0;

/// @title Infer Call
/// @notice This contract is used to run on-chain inference.
/// This custom contract will set on 0x000000000000000000000000000000000000011a since we set it in precompile.go.
interface ArbInference {
    function inferCall(bytes memory model, bytes memory input) external returns (bytes memory);
    function inferCallZK(bytes memory model, bytes memory input) external returns (bytes memory);
}
```

{% endcode %}

{% code title="zkMLInference.sol" %}

```solidity
pragma solidity ^0.8.18;

import "contracts/ArbInference.sol";

contract zkMLInference {
    string value;

    function zkInfer(
        string calldata modelName,
        string calldata inputData
    ) public {
        value = string(abi.encodePacked(ArbInference(address(0x11a)).inferCallZK(abi.encodePacked(modelName), abi.encodePacked(inputData))));
    }
    
    function getValue() public view returns (string memory) {
        return value;
    }
}
```

{% endcode %}


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