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Overview
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<p>受到 <a target="_blank" rel="noopener" href="https://info.deeplearning.ai/how-to-build-a-career-in-ai-book">Andrew Ng - How to Build Your Career in AI</a> 啟發，完成一個 Python 小工具，想知道我的可用天數還有多少，才發現原來只剩1萬天了?!(<s>這本電子書不是講AI職涯的嗎XD</s>)</p>
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<a href="/blog/mongodb-compass-gui-introduction/" class="post-title-link" itemprop="url">MongoDB Compass 圖形介面操作資料庫</a>
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<p>先前我們使用具體的操作範例比較 Oracle DB JSON 與 MongoDB 的差異，請看 <a href="https://estellacoding.github.io/blog/oracledb-json-mongodb-custom-fields">Oracle DB JSON 與 MongoDB 的差異</a>。而這篇要來補充說明，怎麼用 MongoDB Compass 圖形介面操作資料庫。</p>
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<p>上一篇我們提到了 Oracle Database 23ai 對 JSON 的支援，並針對三種資料庫結構進行了效能測試，請看 <a href="https://estellacoding.github.io/blog/oracle-table-schema-json-comparison">實測單一表格、EAV 模型與 JSON 欄位的查詢效能</a>。</p>
<p>但我就有進一步的問題是: 那那…Oracle DB 的 JSON 支援與 MongoDB 有什麼不同？</p>
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<p>Oracle Database 23ai 支援 JSON，這讓我們可以同時使用 SQL 和 JSON 來操作同一資料。本篇文章將針對三種不同的資料庫結構進行實際測試，來比較單一表格、EAV 模型和 JSON 欄位的查詢效能。</p>
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<a href="/blog/oracle-vector-search-langchain-rag/" class="post-title-link" itemprop="url">使用 Oracle 向量資料庫和 LangChain 開發 RAG 應用</a>
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<p>上一篇我們完成 Oracle Database 23ai Free 的開發環境，如果還沒設定好的話，請看 <a href="https://estellacoding.github.io/blog/oracle-vm-db23ai-win/">Win 安裝 Oracle VM VirtualBox + Database 23ai</a>。</p>
<p>本篇會先帶大家了解向量搜尋基本概念後，再分享如何使用 Oracle 資料庫和 LangChain 建立一個 RAG 應用，是參照 Oracle LiveLabs 這篇 <a target="_blank" rel="noopener" href="https://apexapps.oracle.com/pls/apex/f?p=133:180:108165763619849::::wid:3927">AI Vector Search - 7 Easy Steps to Building a RAG Application using LangChain</a> 的教學來實現「使用 Oracle 向量資料庫和 LangChain 開發 RAG 應用」。</p>
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<p>由於 Oracle Database 23ai 版本新增了向量資料庫和向量搜尋的功能，當然就要來用看看！但在申請 Oracle Cloud 免費版時，我遇到了信用卡驗證的問題(反覆試信用卡是有跳出被刷了10幾次R)。</p>
<p>為了能夠體驗 Oracle Database 23ai Free 版本，我選擇在本地環境中安裝 Oracle VM VirtualBox。本文將一步一步帶著你在 Windows 系統上成功設置 Oracle VM VirtualBox 和 Oracle Database 23ai，同時安裝 Python 和 VS Code，打造一個適合碼農開發的環境。(花了我2天QQ)</p>
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<p>Oracle APEX 是用於 Oracle 資料庫的低代碼應用開發平台，我們會依照 Oracle LiveLabs 這篇文章 <a target="_blank" rel="noopener" href="https://apexapps.oracle.com/pls/apex/r/dbpm/livelabs/view-workshop?wid=633">Smart Project Management App with AI-Assisted Development in Oracle APEX</a> 中的一步一步的教學引導，在 Oracle APEX AI Assistant 輔助(<s>沒有AI幫忙不會寫程式了😂</s>)下建立一個專案管理應用程式，詳細請看 <a target="_blank" rel="noopener" href="https://apexapps.oracle.com/pls/apex/r/dbpm/livelabs/run-workshop?p210_wid=633&p210_wec=&session=79497038985">這篇教學</a>。</p>
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<p>本篇文章介紹卷積神經網路(CNN)，並實作了一個自定義的 CNN 模型來識別 MNIST 手寫資料集。</p>
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<p>一般訓練模型時，會將資料集切割成 3 部份，訓練集(train)、驗證集(validation)與測試集(test)。在訓練階段，AutoKeras 會使用訓練集來訓練模型，並使用驗證集來評估訓練表現。當模型訓練完成，我們就會使用測試集做模型的評估。</p>
<p>在本篇中，我們會介紹該如何準備資料集以及資料夾的結構，以便 AutoKeras 能夠正確地讀取數據。</p>
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