## Pie Chart: Error Distribution in Question Answering Systems
### Overview
The image presents four pie charts comparing the distribution of different error types in two question answering systems (CWQ and WebQSP) using two different knowledge graphs (CKG and IKG). The error types are Invalid Action Error, Relation Selecting Error, Neighbor Selection Error, Reasoning Error, and Decompose Error.
### Components/Axes
* **Titles:**
* CWQ (CKG) - Top-left pie chart
* CWQ (IKG) - Top-middle-left pie chart
* WebQSP (CKG) - Top-middle-right pie chart
* WebQSP (IKG) - Top-right pie chart
* **Legend (Left side):**
* Yellow with diagonal lines: Invalid Action Error
* Light green with dots: Relation Selecting Error
* Dark green with diagonal lines: Neighbor Selection Error
* Red with diagonal lines: Reasoning Error
* Pink with diagonal lines: Decompose Error
### Detailed Analysis
**CWQ (CKG):**
* Invalid Action Error (Yellow): 2%
* Relation Selecting Error (Light Green): 38%
* Neighbor Selection Error (Dark Green): 12%
* Reasoning Error (Red): 32%
* Decompose Error (Pink): 16%
**CWQ (IKG):**
* Invalid Action Error (Yellow): 4%
* Relation Selecting Error (Light Green): 10%
* Neighbor Selection Error (Dark Green): 36%
* Reasoning Error (Red): 32%
* Decompose Error (Pink): 18%
**WebQSP (CKG):**
* Invalid Action Error (Yellow): 2%
* Relation Selecting Error (Light Green): 40%
* Neighbor Selection Error (Dark Green): 18%
* Reasoning Error (Red): 34%
* Decompose Error (Pink): 6%
**WebQSP (IKG):**
* Invalid Action Error (Yellow): 2%
* Relation Selecting Error (Light Green): 12%
* Neighbor Selection Error (Dark Green): 36%
* Reasoning Error (Red): 46%
* Decompose Error (Pink): 4%
### Key Observations
* **CWQ vs WebQSP:** The distribution of errors differs significantly between CWQ and WebQSP. CWQ has a higher percentage of Relation Selecting Errors, while WebQSP has a higher percentage of Reasoning Errors.
* **CKG vs IKG:** The choice of knowledge graph (CKG vs IKG) also impacts the error distribution. For CWQ, using IKG increases the Neighbor Selection Error and Decompose Error, while decreasing the Relation Selecting Error. For WebQSP, using IKG increases the Reasoning Error and Neighbor Selection Error, while decreasing the Relation Selecting Error.
* **Reasoning Error:** Reasoning Error is the most prominent error in WebQSP (IKG) at 46%.
* **Relation Selecting Error:** Relation Selecting Error is the most prominent error in CWQ (CKG) at 38%.
* **Invalid Action Error:** Invalid Action Error is consistently the smallest error across all four scenarios.
### Interpretation
The pie charts illustrate the error profiles of two question answering systems (CWQ and WebQSP) when using different knowledge graphs (CKG and IKG). The data suggests that the type of question answering system and the choice of knowledge graph significantly influence the types of errors encountered.
* CWQ appears to struggle more with relation selection, while WebQSP struggles more with reasoning.
* The IKG knowledge graph seems to shift the error distribution towards Neighbor Selection and Reasoning Errors, potentially indicating that IKG presents more complex relationships that are harder to navigate or reason about.
* The low percentage of Invalid Action Errors across all scenarios suggests that the systems are generally performing valid actions, but are struggling with selecting the correct relations, neighbors, or reasoning steps.
