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    --- tags: 2021-organize, 2021-program --- 🔙 Back to [歷年 PyCon TW Organizing 共筆](/ryPr7SFyP/%2FHM5mHCFKQCu7-W5ea8ITcw%3Fview) 🔙 Back to [PyCon TW 2021 Organizing 共筆](/Wb9vQrfJQk-5tPoPR23hwA) 🔙 Back to [PyCon TW 2020 Organizing 共筆](/5u84SOprTUeQYBR57TH49w) # PyCon TW x PyHUG Meetup 共筆 :::info 歡迎來到 PyCon TW x Taichung.py 2021 共筆 :mega: [YT 連結]() [回饋單連結](https://forms.gle/qYib9XefEjJGHK3R7) [【How to process ECG signal for Machine Learning】 slido 連結](https://app.sli.do/event/w6wpocxm/) [【Use machine learning to generate medical report】 slido 連結](https://app.sli.do/event/vp55etgo/) ::: ## 共筆 ### 1. How deep learning helps astronomers on observation data - CNN for classifying galaxy spectra 講者: Inès <iframe src="https://app.sli.do/event/tffoga6f/live/questions" height=450 width=100%></iframe> > 共筆從此開始 為什麼研究星系? 尺度 - 46kpc -> 151530光年 怎麼研究? - 觀測: 亮度/大小/元素 - 不同波段觀察到不同機制 - 可見光: 恆星類 - UV光: 剛誕生恆星 - 從觀測資料推測: - 物理性質: 黑洞質量 目前的問題? - 目標: 西佛星系 (Seyfert) - 因為有活躍的吸積過程 - 問題 - 分類挑選困難 - 類型過多: - 早期肉眼挑 - 1990: 兩條特殊譜線的比值 - 1997-now: 擬合光譜, (用兩條 Gaussian) - 花類大量時間,但也無法確定光譜是否同時擁有兩個特徵 - 尚未確定輻射機制 - 不清楚為何光譜會同時出現兩個特徵 - 還在爭論中 Deep Learning - 天文觀測 - 處理分成影像和光譜 - 觀察數值強度 資料處理與分析 - 製作星系列表: pandas. astropy - 下載光譜檔案 - 預處理光譜檔案 - 建立 cnn 模型 - 擬和星系光譜 SDSS - 全天觀測:有影像及可見光等光譜開放資料 - 有教學如何取得資料 - 幾百萬影像與光譜資料 - 每一兩年會有新資料 製作星系列表 - SkyServer - SQL Search 預處理光譜檔案 - 使用 astropy 套件讀取 FITS 格式檔案,後使用 pandas normalize 擬和星系光譜 - lmfit: 可提供擬合誤差 總結 - 使用一維 cnn 模型來分類光譜效率較以往分類方式高 - 增加訓練樣本數來提升模型辨別能力 - 透過此 cnn model 收集更多不同星系資料 Q.A - train test set 切分方式: - random 分類 - 其他研究領域 - 靠 nn 分析光譜得到 恆星年紀 - 用 gan 產出宇宙論 - 使用 con layer 而非 linear layer - 看重 pixel 相關特徵 - 但如果不同波段光譜的資料缺漏太多效果也不見得好 - 物理系 code 契機 - 大四計算機物理課程 - 暑期研習 ### 2. Machine Learning Applied to Stock Index Performance Enhancement 講者: Tina Hsu <iframe src="https://app.sli.do/event/4p89bcmv/live/questions" height=450 width=100%></iframe> > 共筆從此開始 Enhance the model - Time series data dealing - 22 -> 667 特徵 - Feature selection - 60% sample - Feature Normalization - 如果採用其他模型可 normalize - 目前使用 random forest - Leaf pruning: 10% of samples - 用 vote 方式挑選表現好的股票 S&P 500 total returns - 目前方法總報酬都超過標的 - 大部分行情好時超過 S&P 500 - 行情不好時跌會比大盤多 總結 - 解決不同時期不同重要因子的問題 - 1%~5% 投資組合 -> 2% 投資組合目前效果最好 - 缺陷 - 行情表現不好時投資組合會落後大盤 - 前期價格表現變動對模型影響大 - 接近動能類型策略 QA - 開源? - 資料可用性關係可能沒辦法開放 ### 3. The 2020 CVPR Workshop of Low-Power Computer Vision Challenge 參加經驗分享 講者: 林明憲 <iframe src="https://app.sli.do/event/x20pugwu/live/questions" height=450 width=100%></iframe> > 共筆從此開始 Low-Power 領域電腦視覺競賽 動機 - 研究所畢業多年 - 提升 python 能力 - software define hardware 時代 - 跳脫舒適圈 LPCVC 背景介紹 - CV 三大會議: ICCV(2y) / CVPR(1y) / ECCV(2y) - 與 ICCV / CVPR 同步舉行之 low power cv 競賽 - 3 track 評分標準 - 團隊限制每日提交一次 - 影像分類 - ImageNet: 1000 類 - 指標 - 準確度超過 68.5% - 有 latency 限制 (根據公式) - 平台簡介 - Ultra96V2: 單板電腦 - DPU: 用來加速神經網路 - PYNQ: 專為 FPGA 設計的 python 框架 - Vitis-AI: Xilinx AI stack (compile tool) 先前準備及挑戰策略 - 籌組團隊 - 資源檢視 - 模型挑選 - 目標設定 ![](https://i.imgur.com/iYoLrXa.png) ### 4. Implementing NMF in PyTorch Framework: An Autograd Approach 講者: Chin-Yun Yu <iframe src="https://app.sli.do/event/ejvtyili/live/questions" height=450 width=100%></iframe> > 共筆從此開始 今日slide: https://docs.google.com/presentation/d/1Ji-9dc2SVUdx3Me5fEJalT4gTaTZwBr7rvs7Ko2Xoog/edit?usp=sharing

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