This visualization shows the performance of a Vanilla Policy Gradient (VPG) agent in the Walker environment over time, plotting performance against the number of interactions on a line chart. The chart includes axes with tick marks, axis labels, and a title, all rendered as SVG using D3 v5. The code uses `d3.csv` to load data from a VizHub-hosted dataset, `d3.scaleLinear` for both x and y axes, and `d3.line` with `curveBasis` to draw the smoothed line path. Data is parsed from CSV strings to numbers before rendering.