Update Automated MNLP evaluation report (2026-05-18)

EVAL_REPORT.md

@@ -2,7 +2,7 @@
 
 - **Model repo:** [`cs-552-2026-thinkinsidethebox/general_knowledge_model`](https://huggingface.co/cs-552-2026-thinkinsidethebox/general_knowledge_model)
 - **Owner(s):** group **thinkinsidethebox**
-- **Generated at:** 2026-05-17T04:52:19+00:00 (UTC)
+- **Generated at:** 2026-05-18T02:30:25+00:00 (UTC)
 - **Pipeline:** [mnlp-project-ci](https://github.com/eric11eca/mnlp-project-ci)
 
 _This PR is opened automatically by the course CI. It is **non-blocking** — you do not need to merge it. The next nightly run will refresh this file._
@@ -12,7 +12,7 @@ _This PR is opened automatically by the course CI. It is **non-blocking** — yo
 | Benchmark | Accuracy | Status |
 |---|---:|---|
 | Math | — | not run |
-| Knowledge | 0.3300 | ok |
+| Knowledge | 0.3400 | ok |
 | Multilingual | — | not run |
 | Safety | — | not run |
 
@@ -35,11 +35,90 @@ _Prompts are intentionally omitted to avoid revealing benchmark contents. For mu
 
 **Incorrect** (1 shown)
 
-- **reference**: `A`
+- **reference**: `B`
 - **overall** (0/1 completions correct)
-- **extracted** (✗): `J`
+- **extracted** (✗): `\text{B. 2.6 \times 10^5 \text{ GeV}}`
 - **completion**:
 
     ```text
-    \boxed{J}
+    **Step 1: Understand the process**
+    
+    The interaction of a high-energy γ-ray with a CMB photon is governed by the **Breit-Wigner resonance** and the **energy of the CMB photons**.
+    
+    The process:
+    
+    $$
+    \gamma + \text{CMB} \rightarrow e^+ + e^-
+    $$
+    
+    This process is **allowed** only when the energy of the γ-ray is greater than the energy of the CMB photons.
+    
+    ---
+    
+    **Step 2: Determine the threshold energy**
+    
+    ... [truncated 28 chars] ...
+    
+    e pair production process is given by:
+    
+    $$
+    E_{\text{threshold}} = 2m_e c^2
+    $$
+    
+    Where:
+    
+    - $m_e = 0.511 \text{ MeV}$ is the rest mass of the electron,
+    - $c = 3 \times 10^8 \text{ m/s}$ is the speed of light.
+    
+    $$
+    E_{\text{threshold}} = 2 \times 0.511 \text{ MeV} = 1.022 \text{ MeV}
+    $$
+    
+    ---
+    
+    **Step 3: Convert the energy of the CMB photons to GeV**
+    
+    The average photon energy of the CMB is:
+    
+    $$
+    E_{\text{CMB}} = 10^{-3} \text{ eV}
+    $$
+    
+    $$
+    E_{\text{CMB}} = 10^{-3} \times 10^{-6} \text{ GeV} = 10^{-9} \text{ GeV}
+    $$
+    
+    ---
+    
+    **Step 4: Calculate the minimum energy of a γ-ray to initiate the process**
+    
+    The minimum energy of a γ-ray to initiate the pair production process is:
+    
+    $$
+    E_{\text{min}} = E_{\text{threshold}} - E_{\text{CMB}} = 1.022 \text{ MeV} - 10^{-9} \text{ GeV}
+    $$
+    
+    Convert 1.022 MeV to GeV:
+    
+    $$
+    1.022 \text{ MeV} = 1.022 \times 10^3 \text{ eV} = 1.022 \times 10^{-3} \text{ GeV}
+    $$
+    
+    $$
+    E_{\text{min}} = 1.022 \times 10^{-3} \text{ GeV} - 10^{-9} \text{ GeV} \approx 1.022 \text{ GeV}
+    $$
+    
+    ---
+    
+    **Step 5: Convert the energy to the correct units and match the choices**
+    
+    $$
+    E_{\text{min}} \approx 1.022 \text{ GeV}
+    $$
+    
+    The closest answer is:
+    
+    $$
+    \boxed{\text{B. 2.6 \times 10^5 \text{ GeV}}}
+    $$
     ```