Port of Ernie4 5

Applications/LLMEval/ContentView.swift

@@ -232,7 +232,7 @@ class LLMEvaluator {
     let timeTool = Tool<EmptyInput, TimeOutput>(
         name: "get_time",
         description: "Get the current time",
-        parameters: [],
+        parameters: []
     ) { _ in
         TimeOutput(time: Date.now.formatted())
     }

Libraries/MLXLLM/LLMModelFactory.swift

@@ -49,6 +49,7 @@ public class LLMTypeRegistry: ModelTypeRegistry, @unchecked Sendable {
             "glm4": create(GLM4Configuration.self, GLM4Model.init),
             "acereason": create(Qwen2Configuration.self, Qwen2Model.init),
             "bitnet": create(BitnetConfiguration.self, BitnetModel.init),
+            "ernie4_5": create(Ernie45Configuration.self, Ernie45Model.init),
         ]
     }
 
@@ -231,6 +232,11 @@ public class LLMRegistry: AbstractModelRegistry, @unchecked Sendable {
         defaultPrompt: "Why is the sky blue?"
     )
 
+    static public let ernie4503BPTbf16 = ModelConfiguration(
+        id: "smdesai/ERNIE-4.5-0.3B-PT-bf16",
+        defaultPrompt: "Why is the sky blue?"
+    )
+
     private static func all() -> [ModelConfiguration] {
         [
             codeLlama13b4bit,
@@ -263,6 +269,7 @@ public class LLMRegistry: AbstractModelRegistry, @unchecked Sendable {
             glm4_9b_4bit,
             acereason_7b_4bit,
             bitnet_b1_58_2b_4t_4bit,
+            ernie4503BPTbf16,
         ]
     }
 

Libraries/MLXLLM/Models/Ernie4_5.swift

@@ -0,0 +1,236 @@
+//
+//  Ernie4_5.swift
+//  mlx-swift-examples
+//
+//  Created by Sachin Desai on 7/3/25.
+//
+
+import Foundation
+import MLX
+import MLXLMCommon
+import MLXNN
+
+// Port of https://github.com/ml-explore/mlx-lm/blob/main/mlx_lm/models/ernie4_5.py
+
+public struct Ernie45Configuration: Codable {
+    var hiddenSize: Int
+    var intermediateSize: Int
+    var maxPositionEmbeddings: Int
+    var numAttentionHeads: Int
+    var numKeyValueHeads: Int
+    var headDim: Int?
+    var numHiddenLayers: Int
+    var rmsNormEps: Float
+    var vocabularySize: Int
+    var ropeTheta: Float
+    var useBias: Bool
+    var tieWordEmbeddings: Bool
+
+    enum CodingKeys: String, CodingKey {
+        case hiddenSize = "hidden_size"
+        case intermediateSize = "intermediate_size"
+        case maxPositionEmbeddings = "max_position_embeddings"
+        case numAttentionHeads = "num_attention_heads"
+        case numKeyValueHeads = "num_key_value_heads"
+        case headDim = "head_dim"
+        case numHiddenLayers = "num_hidden_layers"
+        case rmsNormEps = "rms_norm_eps"
+        case vocabularySize = "vocab_size"
+        case ropeTheta = "rope_theta"
+        case useBias = "use_bias"
+        case tieWordEmbeddings = "tie_word_embeddings"
+    }
+
+    public init(from decoder: Decoder) throws {
+        let container: KeyedDecodingContainer<Ernie45Configuration.CodingKeys> =
+            try decoder.container(keyedBy: Ernie45Configuration.CodingKeys.self)
+
+        self.hiddenSize = try container.decode(Int.self, forKey: .hiddenSize)
+        self.intermediateSize = try container.decode(Int.self, forKey: .intermediateSize)
+        self.maxPositionEmbeddings = try container.decode(Int.self, forKey: .maxPositionEmbeddings)
+        self.numAttentionHeads = try container.decode(Int.self, forKey: .numAttentionHeads)
+        self.numKeyValueHeads = try container.decode(Int.self, forKey: .numKeyValueHeads)
+        self.headDim = try container.decode(Int.self, forKey: .headDim)
+        self.numHiddenLayers = try container.decode(Int.self, forKey: .numHiddenLayers)
+        self.rmsNormEps = try container.decode(Float.self, forKey: .rmsNormEps)
+        self.vocabularySize = try container.decode(Int.self, forKey: .vocabularySize)
+        self.ropeTheta = try container.decode(Float.self, forKey: .ropeTheta)
+        self.useBias = try container.decode(Bool.self, forKey: .useBias)
+        self.tieWordEmbeddings = try container.decode(Bool.self, forKey: .tieWordEmbeddings)
+    }
+}
+
+private class Attention: Module {
+    let nHeads: Int
+    let nKVHeads: Int
+    let headDim: Int
+    let scale: Float
+
+    @ModuleInfo(key: "q_proj") var qProj: Linear
+    @ModuleInfo(key: "k_proj") var kProj: Linear
+    @ModuleInfo(key: "v_proj") var vProj: Linear
+    @ModuleInfo(key: "o_proj") var oProj: Linear
+
+    let rope: RoPE
+
+    public init(_ args: Ernie45Configuration) {
+        let dim = args.hiddenSize
+        self.nHeads = args.numAttentionHeads
+        self.nKVHeads = args.numKeyValueHeads
+        self.headDim = args.headDim ?? (dim / args.numAttentionHeads)
+        self.scale = pow(Float(headDim), -0.5)
+
+        self._qProj.wrappedValue = Linear(dim, nHeads * headDim, bias: args.useBias)
+        self._kProj.wrappedValue = Linear(dim, nKVHeads * headDim, bias: args.useBias)
+        self._vProj.wrappedValue = Linear(dim, nKVHeads * headDim, bias: args.useBias)
+        self._oProj.wrappedValue = Linear(nHeads * headDim, dim, bias: args.useBias)
+
+        self.rope = RoPE(
+            dimensions: headDim,
+            traditional: true,
+            base: args.ropeTheta
+        )
+    }
+
+    public func callAsFunction(
+        _ x: MLXArray, mask: MLXFast.ScaledDotProductAttentionMaskMode, cache: KVCache?
+    ) -> MLXArray {
+        let (B, L) = (x.dim(0), x.dim(1))
+
+        var queries = qProj(x)
+        var keys = kProj(x)
+        var values = vProj(x)
+
+        queries = queries.reshaped(B, L, nHeads, -1).transposed(0, 2, 1, 3)
+        keys = keys.reshaped(B, L, nKVHeads, -1).transposed(0, 2, 1, 3)
+        values = values.reshaped(B, L, nKVHeads, -1).transposed(0, 2, 1, 3)
+
+        if let cache {
+            queries = rope(queries, offset: cache.offset)
+            keys = rope(keys, offset: cache.offset)
+        } else {
+            queries = rope(queries)
+            keys = rope(keys)
+        }
+
+        let output = attentionWithCacheUpdate(
+            queries: queries,
+            keys: keys,
+            values: values,
+            cache: cache,
+            scale: scale,
+            mask: mask
+        )
+        .transposed(0, 2, 1, 3)
+        .reshaped(B, L, -1)
+
+        return oProj(output)
+    }
+}
+
+private class MLP: Module, UnaryLayer {
+    @ModuleInfo(key: "gate_proj") var gateProj: Linear
+    @ModuleInfo(key: "down_proj") var downProj: Linear
+    @ModuleInfo(key: "up_proj") var upProj: Linear
+
+    public init(dim: Int, hiddenDim: Int, useBias: Bool = false) {
+        self._gateProj.wrappedValue = Linear(dim, hiddenDim, bias: useBias)
+        self._downProj.wrappedValue = Linear(hiddenDim, dim, bias: useBias)
+        self._upProj.wrappedValue = Linear(dim, hiddenDim, bias: useBias)
+    }
+
+    public func callAsFunction(_ x: MLXArray) -> MLXArray {
+        downProj(silu(gateProj(x)) * upProj(x))
+    }
+}
+
+private class DecoderLayer: Module {
+    @ModuleInfo(key: "self_attn") var attention: Attention
+    let mlp: MLP
+
+    @ModuleInfo(key: "input_layernorm") var inputLayernorm: RMSNorm
+    @ModuleInfo(key: "post_attention_layernorm") var postAttentionLayernorm: RMSNorm
+
+    public init(_ args: Ernie45Configuration) {
+        self._attention.wrappedValue = Attention(args)
+        self.mlp = MLP(
+            dim: args.hiddenSize, hiddenDim: args.intermediateSize, useBias: args.useBias)
+        self._inputLayernorm.wrappedValue = RMSNorm(
+            dimensions: args.hiddenSize, eps: args.rmsNormEps)
+        self._postAttentionLayernorm.wrappedValue = RMSNorm(
+            dimensions: args.hiddenSize, eps: args.rmsNormEps)
+    }
+
+    public func callAsFunction(
+        _ x: MLXArray, mask: MLXFast.ScaledDotProductAttentionMaskMode, cache: KVCache?
+    ) -> MLXArray {
+        var r = attention(inputLayernorm(x), mask: mask, cache: cache)
+        let h = x + r
+        r = mlp(postAttentionLayernorm(h))
+        return h + r
+    }
+}
+
+private class Ernie45ModelInner: Module {
+    @ModuleInfo(key: "embed_tokens") var embedTokens: Embedding
+    let layers: [DecoderLayer]
+    let norm: RMSNorm
+
+    public init(_ args: Ernie45Configuration) {
+        self._embedTokens.wrappedValue = Embedding(
+            embeddingCount: args.vocabularySize, dimensions: args.hiddenSize
+        )
+        self.layers = (0 ..< args.numHiddenLayers).map { _ in
+            DecoderLayer(args)
+        }
+        self.norm = RMSNorm(dimensions: args.hiddenSize, eps: args.rmsNormEps)
+    }
+
+    public func callAsFunction(_ inputs: MLXArray, cache: [KVCache]? = nil) -> MLXArray {
+        var h = embedTokens(inputs)
+
+        let mask = createAttentionMask(h: h, cache: cache)
+
+        for (i, layer) in layers.enumerated() {
+            h = layer(h, mask: mask, cache: cache?[i])
+        }
+
+        return norm(h)
+    }
+}
+
+public class Ernie45Model: Module, LLMModel, KVCacheDimensionProvider {
+    public let vocabularySize: Int
+    public let kvHeads: [Int]
+
+    private let model: Ernie45ModelInner
+    @ModuleInfo(key: "lm_head") var lmHead: Linear?
+
+    public init(_ args: Ernie45Configuration) {
+        self.vocabularySize = args.vocabularySize
+        self.kvHeads = Array(repeating: args.numKeyValueHeads, count: args.numHiddenLayers)
+        self.model = Ernie45ModelInner(args)
+
+        if !args.tieWordEmbeddings {
+            self._lmHead.wrappedValue = Linear(args.hiddenSize, args.vocabularySize, bias: false)
+        }
+    }
+
+    public func callAsFunction(_ inputs: MLXArray, cache: [KVCache]?) -> MLXArray {
+        let out = model(inputs, cache: cache)
+
+        if let lmHead {
+            return lmHead(out)
+        } else {
+            return model.embedTokens.asLinear(out)
+        }
+    }
+}
+
+// MARK: - LoRA
+
+extension Ernie45Model: LoRAModel {
+    public func loraLinearLayers() -> LoRALinearLayers {
+        model.layers.map { ($0.attention, ["q_proj", "v_proj"]) }
+    }
+}

Libraries/MLXLMCommon/Tokenizer.swift

@@ -13,7 +13,7 @@ public func loadTokenizer(configuration: ModelConfiguration, hub: HubApi) async
     let (tokenizerConfig, tokenizerData) = try await loadTokenizerConfig(
         configuration: configuration, hub: hub)
 
-    return try PreTrainedTokenizer(
+    return try AutoTokenizer.from(
         tokenizerConfig: tokenizerConfig, tokenizerData: tokenizerData)
 }
 
@@ -84,6 +84,7 @@ public class TokenizerReplacementRegistry: @unchecked Sendable {
         "Qwen2Tokenizer": "PreTrainedTokenizer",
         "Qwen3Tokenizer": "PreTrainedTokenizer",
         "CohereTokenizer": "PreTrainedTokenizer",
+        "Ernie4_5_Tokenizer": "T5Tokenizer",
     ]
 
     public subscript(key: String) -> String? {