{
  "session_id": "session_data_20260409_204111",
  "total_duration_s": 2823.7,
  "n_input_spans": 64,
  "session_goal": "Knit green and yellow fabric with knitting needles, seam edges, and knit green fabric.",
  "sub_goals": [
    {
      "sub_goal_id": 1,
      "start_time": 0.0,
      "end_time": 1717.8,
      "description": "Knit green and yellow fabric with knitting needles, adjusting yarn and inspecting stitches.",
      "episodes": [
        {
          "episode_id": 1,
          "start_time": 0.0,
          "end_time": 1294.5,
          "description": "Knit green and yellow fabric, adjust yarn length, and inspect stitches.",
          "span_indices": [
            0,
            1,
            2,
            3,
            4,
            5,
            6,
            7,
            8,
            9,
            10,
            11,
            12,
            13,
            14,
            15,
            16,
            17,
            18,
            19,
            20,
            21,
            22,
            23,
            24,
            25,
            26,
            27,
            28
          ]
        },
        {
          "episode_id": 2,
          "start_time": 1294.5,
          "end_time": 1717.8,
          "description": "Attach new green yarn and continue knitting green and yellow fabric.",
          "span_indices": [
            29,
            30,
            31,
            32,
            33,
            34,
            35,
            36
          ]
        }
      ]
    },
    {
      "sub_goal_id": 2,
      "start_time": 1717.8,
      "end_time": 2700.0,
      "description": "Seam edges of knitted fabric and continue knitting green and yellow yarn.",
      "episodes": [
        {
          "episode_id": 3,
          "start_time": 1717.8,
          "end_time": 1800.0,
          "description": "Seam edges of green and yellow knitted fabric with knitting needle.",
          "span_indices": [
            37
          ]
        },
        {
          "episode_id": 4,
          "start_time": 1800.0,
          "end_time": 2700.0,
          "description": "Resume knitting green and yellow fabric with knitting needles.",
          "span_indices": [
            38,
            39,
            40,
            41,
            42,
            43,
            44,
            45,
            46,
            47,
            48,
            49,
            50,
            51,
            52,
            53,
            54,
            55,
            56,
            57
          ]
        }
      ]
    },
    {
      "sub_goal_id": 3,
      "start_time": 2700.0,
      "end_time": 2823.7,
      "description": "Knit green fabric with knitting needles and place finished fabric on lap.",
      "episodes": [
        {
          "episode_id": 5,
          "start_time": 2700.0,
          "end_time": 2782.1,
          "description": "Knit green fabric, reposition fabric, and adjust tension.",
          "span_indices": [
            58,
            59,
            60,
            61
          ]
        },
        {
          "episode_id": 6,
          "start_time": 2782.1,
          "end_time": 2823.7,
          "description": "Resume knitting green fabric and place knitted fabric and needles on lap.",
          "span_indices": [
            62,
            63
          ]
        }
      ]
    }
  ]
}