{
  "session_id": "session_data_20260408_095020",
  "total_duration_s": 1224.2,
  "n_input_spans": 128,
  "session_goal": "Sew pink and green patterned fabrics, attach orange-pink strips to a large garment, sew binding and edges, and assemble a pink strap with small pieces.",
  "sub_goals": [
    {
      "sub_goal_id": 1,
      "start_time": 0.0,
      "end_time": 300.0,
      "description": "Sew pink and green fabrics, combine them, and attach a pink strip.",
      "episodes": [
        {
          "episode_id": 1,
          "start_time": 0.0,
          "end_time": 71.0,
          "description": "Observe workspace and sew pink patterned fabric on machine.",
          "span_indices": [
            0,
            1,
            2,
            3,
            4,
            5,
            6,
            7
          ]
        },
        {
          "episode_id": 2,
          "start_time": 71.0,
          "end_time": 94.0,
          "description": "Sew green patterned fabric and place it on table.",
          "span_indices": [
            8,
            9,
            10,
            11,
            12
          ]
        },
        {
          "episode_id": 3,
          "start_time": 94.0,
          "end_time": 169.0,
          "description": "Sew pink fabric, adjust phone, and sew short seam.",
          "span_indices": [
            13,
            14,
            15,
            16,
            17,
            18,
            19,
            20,
            21,
            22
          ]
        },
        {
          "episode_id": 4,
          "start_time": 169.0,
          "end_time": 183.0,
          "description": "Combine green and pink fabrics by sewing them together.",
          "span_indices": [
            23,
            24,
            25,
            26
          ]
        },
        {
          "episode_id": 5,
          "start_time": 183.0,
          "end_time": 266.0,
          "description": "Sew pink patterned fabric after repositioning and turning.",
          "span_indices": [
            27,
            28,
            29,
            30,
            31,
            32
          ]
        },
        {
          "episode_id": 6,
          "start_time": 266.0,
          "end_time": 300.0,
          "description": "Align pink strip, cut thread, and sew strip to main pink fabric.",
          "span_indices": [
            33,
            34,
            35,
            36,
            37
          ]
        }
      ]
    },
    {
      "sub_goal_id": 2,
      "start_time": 300.0,
      "end_time": 600.0,
      "description": "Assemble orange-pink strips and sew each onto the large garment.",
      "episodes": [
        {
          "episode_id": 1,
          "start_time": 300.0,
          "end_time": 414.1,
          "description": "Sew three orange-pink strips together into a multi-strip assembly.",
          "span_indices": [
            38,
            39,
            40,
            41,
            42,
            43,
            44,
            45,
            46,
            47,
            48,
            49,
            50,
            51,
            52,
            53
          ]
        },
        {
          "episode_id": 2,
          "start_time": 414.1,
          "end_time": 452.6,
          "description": "Align and sew first orange-pink strip to large garment.",
          "span_indices": [
            54,
            55,
            56,
            57,
            58,
            59
          ]
        },
        {
          "episode_id": 3,
          "start_time": 452.6,
          "end_time": 494.1,
          "description": "Align and sew second orange-pink strip to large garment.",
          "span_indices": [
            60,
            61,
            62,
            63,
            64
          ]
        },
        {
          "episode_id": 4,
          "start_time": 494.1,
          "end_time": 534.2,
          "description": "Align and sew third orange-pink strip to large garment.",
          "span_indices": [
            65,
            66,
            67,
            68,
            69
          ]
        },
        {
          "episode_id": 5,
          "start_time": 534.2,
          "end_time": 573.5,
          "description": "Align and sew fourth orange-pink strip to large garment.",
          "span_indices": [
            70,
            71,
            72,
            73,
            74
          ]
        },
        {
          "episode_id": 6,
          "start_time": 573.5,
          "end_time": 600.0,
          "description": "Reposition garment, align final strip, and sew it onto the edge.",
          "span_indices": [
            75,
            76,
            77,
            78
          ]
        }
      ]
    },
    {
      "sub_goal_id": 3,
      "start_time": 600.0,
      "end_time": 1103.3,
      "description": "Sew binding strip onto fabric, trim edges, and sew all edge sections.",
      "episodes": [
        {
          "episode_id": 1,
          "start_time": 600.0,
          "end_time": 765.0,
          "description": "Sew binding strip onto pink-orange fabric, trim excess, and align edges.",
          "span_indices": [
            79,
            80,
            81,
            82,
            83,
            84
          ]
        },
        {
          "episode_id": 2,
          "start_time": 765.0,
          "end_time": 900.0,
          "description": "Sew aligned edge of pink-orange fabric with sewing machine.",
          "span_indices": [
            85,
            86,
            87
          ]
        },
        {
          "episode_id": 3,
          "start_time": 900.0,
          "end_time": 1103.3,
          "description": "Sew multiple edge sections of large pink-orange fabric, then cut thread and move fabric.",
          "span_indices": [
            88,
            89,
            90,
            91,
            92,
            93,
            94,
            95,
            96,
            97,
            98,
            99,
            100,
            101,
            102,
            103,
            104,
            105,
            106,
            107,
            108,
            109,
            110,
            111,
            112,
            113,
            114
          ]
        }
      ]
    },
    {
      "sub_goal_id": 4,
      "start_time": 1103.3,
      "end_time": 1220.1,
      "description": "Align, sew, and tie pink strap to small fabric pieces.",
      "episodes": [
        {
          "episode_id": 1,
          "start_time": 1103.3,
          "end_time": 1139.8,
          "description": "Align pink strap with small fabric pieces and sew them together.",
          "span_indices": [
            115,
            116,
            117,
            118
          ]
        },
        {
          "episode_id": 2,
          "start_time": 1139.8,
          "end_time": 1200.0,
          "description": "Sew additional seams on small assembly, cut threads, and inspect seams.",
          "span_indices": [
            119,
            120,
            121,
            122,
            123
          ]
        },
        {
          "episode_id": 3,
          "start_time": 1200.0,
          "end_time": 1220.1,
          "description": "Tie small fabric pieces together, observe worktable, and pick up large fabric.",
          "span_indices": [
            124,
            125,
            126,
            127
          ]
        }
      ]
    }
  ]
}