{"record":{"id":"d0f3ffd39d704001","repo":"rohitg00/ai-engineering-from-scratch","slug":"token-embedding-must-be-a-tokenembedding","errorCode":null,"errorMessage":"token_embedding must be a TokenEmbedding","messagePattern":"token_embedding must be a TokenEmbedding","errorType":"exception","errorClass":"TypeError","httpStatus":null,"severity":"error","filePath":"phases/19-capstone-projects/32-token-positional-embeddings/code/main.py","lineNumber":139,"sourceCode":"                f\"seq_len {seq_len} exceeds max_context_length {self.max_context_length}\"\n            )\n        return self.pe[:seq_len]\n\n\nclass EmbeddingComposer(nn.Module):\n    \"\"\"Sums a token embedding with a positional embedding.\n\n    The positional embedding may be learned or sinusoidal.\n    \"\"\"\n\n    def __init__(\n        self,\n        token_embedding: TokenEmbedding,\n        positional_embedding: nn.Module,\n    ) -> None:\n        super().__init__()\n        if not isinstance(token_embedding, TokenEmbedding):\n            raise TypeError(\"token_embedding must be a TokenEmbedding\")\n        if not isinstance(\n            positional_embedding,\n            (LearnedPositionalEmbedding, SinusoidalPositionalEmbedding),\n        ):\n            raise TypeError(\n                \"positional_embedding must be Learned or Sinusoidal Positional Embedding\"\n            )\n        if token_embedding.d_model != getattr(positional_embedding, \"d_model\", None):\n            raise ValueError(\"token and positional embeddings must share d_model\")\n        self.token_embedding = token_embedding\n        self.positional_embedding = positional_embedding\n\n    @property\n    def d_model(self) -> int:\n        return self.token_embedding.d_model\n\n    def forward(self, ids: torch.Tensor) -> torch.Tensor:\n        if ids.dim() != 2:","sourceCodeStart":121,"sourceCodeEnd":157,"githubUrl":"https://github.com/rohitg00/ai-engineering-from-scratch/blob/39ea8a1c6d0b61f071226eff7ede4d4105fed820/phases/19-capstone-projects/32-token-positional-embeddings/code/main.py#L121-L157","documentation":"Error \"token_embedding must be a TokenEmbedding\" thrown in rohitg00/ai-engineering-from-scratch.","triggerScenarios":"Thrown at phases/19-capstone-projects/32-token-positional-embeddings/code/main.py:139 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"39ea8a1c6d0b61f071226eff7ede4d4105fed820","analyzedAt":"2026-08-26T03:13:46.626Z","schemaVersion":2},"datasetVersion":"2026-08-26T07:17:17.940Z"}