JMingo/gemma-4-E4B-it-qat-GGUF overview

---

license: apache-2.0

base_model:

- google/gemma-4-E4B-it-qat-q4_0-unquantized

tags:

- gemma4

---

Near-lossless GGUF quants of:

• google/gemma-4-E4B-it-qat-q4_0-unquantized
• google/gemma-4-E4B-it-qat-q4_0-unquantized-assistant

Uses the chat template from google/gemma-4-E4B-it (2026-05-18), replacing the outdated chat template that was originally bundled with the base QAT model.

---

Original QAT Specifications

The base QAT model was trained with the following specifications:

• Text & Draft Models: 4-bit
• Multimodal Projector (mmproj):

- Audio Encoder: Mostly 2-bit (with some tensors in 4-bit or BF16)

- Vision Encoder: 8-bit

- Other parts: BF16

---

Quantization Error Evaluation

• Dequantization: Quantized weights were dequantized to F32 for evaluation.
• Error Calculation: Quantization error metrics (compared to the BF16 baseline) were computed and accumulated in F64 precision to prevent numerical underflow and precision loss.

Metrics:

• MAE (Mean Absolute Error)
• RMSE (Root Mean Squared Error)
• Max Error

> [!NOTE]

> Interpretation of Metrics:

> These error metrics do not directly reflect actual model performance. This is because imatrix optimization intentionally increases measured error by downweighting less important parameters to improve overall performance. However, these metrics remain useful for estimating how close the quantized model is to the original, lossless quality.

gemma-4-E4B-it-qat

| Model | MAE | RMSE | Max Error |

| :------------------------------------------------------------------------------------------------------------------------------------------------------ | :------------- | :------------- | :------------- |

| JMingo/gemma-4-E4B-it-qat-BF16.gguf (Baseline) | 0.00000000 | 0.00000000 | 0.00000000 |

| JMingo/gemma-4-E4B-it-qat-Q4_0.gguf | 0.00002867 | 0.00005571 | 0.00256348 |

| idkwhattoputherenow/gemma-4-E4B-it-qat-q4_0-unquantized-q4_0-maxerr.gguf | 0.00003258 | 0.00006382 | 0.00299072 |

| unsloth/gemma-4-E4B-it-qat-UD-Q4_K_XL.gguf | 0.00004080 | 0.00007184 | 0.00341797 |

| google/gemma-4-E4B_q4_0-it.gguf | 0.00046331 | 0.00084654 | 0.07275391 |

| lmstudio-community/gemma-4-E4B-it-QAT-Q4_0.gguf | 0.00046331 | 0.00084654 | 0.07275391 |

| mradermacher/gemma-4-E4B-it-qat-q4_0-unquantized.i1-Q4_0.gguf | 0.00024689 | 0.00053073 | 0.03417969 |

| mradermacher/gemma-4-E4B-it-qat-q4_0-unquantized.Q4_K_S.gguf | 0.00048946 | 0.00078925 | 0.04432869 |

| mradermacher/gemma-4-E4B-it-qat-q4_0-unquantized.Q4_K_M.gguf | 0.00047553 | 0.00078097 | 0.04432869 |

| mradermacher/gemma-4-E4B-it-qat-q4_0-unquantized.i1-Q4_1.gguf | 0.00042801 | 0.00076768 | 0.21069336 |

| mradermacher/gemma-4-E4B-it-qat-q4_0-unquantized.i1-Q4_K_S.gguf | 0.00048423 | 0.00078383 | 0.21218872 |

| mradermacher/gemma-4-E4B-it-qat-q4_0-unquantized.i1-Q4_K_M.gguf | 0.00047063 | 0.00077560 | 0.21218872 |

mtp-gemma-4-E4B-it-qat

| Model | MAE | RMSE | Max Error |

| :------------------------------------------------------------------------------------------ | :------------- | :------------- | :------------- |

| JMingo/mtp-gemma-4-E4B-it-qat-BF16.gguf (Baseline) | 0.00000000 | 0.00000000 | 0.00000000 |

| JMingo/mtp-gemma-4-E4B-it-qat-Q4_0.gguf | 0.00005023 | 0.00008237 | 0.00329590 |

| unsloth/mtp-gemma-4-E4B-it.gguf | 0.00007141 | 0.00010650 | 0.00854492 |

mmproj-gemma-4-E4B-it-qat

| Model | MAE | RMSE | Max Error |

| :------------------------------------------------------ | :------------- | :------------- | :------------- |

| JMingo/mmproj-gemma-4-E4B-it-qat-BF16.gguf (Baseline) | 0.00000000 | 0.00000000 | 0.00000000 |

| JMingo/mmproj-gemma-4-E4B-it-qat-Q2_K_XL.gguf | 0.00001205 | 0.00003343 | 0.00271225 |