# ONNX020: undefined-tensor-dtype

**Code:** `ONNX020`

**Name:** `undefined-tensor-dtype`

**Severity:** error

**Category:** spec

**Target:** value

**Fixable:** No

## Message

Tensor dtype is UNDEFINED.

## Suggestion

Set the tensor's dtype to a valid data type.

## Details

Every tensor must have a defined dtype. An UNDEFINED dtype indicates
the tensor's data type was not properly set.