diff --git a/img/ch03/ast.svg b/img/ch03/ast.svg
index d3cf21f..e06ab5e 100644
--- a/img/ch03/ast.svg
+++ b/img/ch03/ast.svg
@@ -3,79 +3,74 @@
 
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new file mode 100644
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+       style="fill:none;stroke:#2f528f;stroke-width:2.25;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:10;stroke-dasharray:none;stroke-opacity:1"
+       id="path177" /><g
+       id="g179"><g
+         id="g181"
+         clip-path="url(#clipPath185)"><text
+           transform="matrix(1,0,0,-1,844.42,256.3)"
+           style="font-variant:normal;font-weight:normal;font-size:24px;font-family:'Microsoft YaHei';-inkscape-font-specification:MicrosoftYaHei;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text189"><tspan
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-           transform="matrix(1,0,0,-1,180.62,219.91)"
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-           id="text5919"><tspan
+           id="text54"><tspan
              x="0"
              y="0"
-             id="tspan5917">Y</tspan></text></g></g><path
+             id="tspan52">X</tspan></text></g></g><g
+       id="g56"><g
+         id="g58"
+         clip-path="url(#clipPath62)"><text
+           transform="matrix(1,0,0,-1,198.26,371.16)"
+           style="font-variant:normal;font-weight:normal;font-size:18px;font-family:'Times New Roman';-inkscape-font-specification:TimesNewRomanPSMT;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text66"><tspan
+             x="0 4.5359998 8.9820004 14.976 19.98 28.044001 37.043999 43.037998 48.042"
+             y="0"
+             sodipodi:role="line"
+             id="tspan64">, flag): </tspan></text></g></g><g
+       id="g68"><g
+         id="g70"
+         clip-path="url(#clipPath74)"><text
+           transform="matrix(1,0,0,-1,133.82,349.56)"
+           style="font-variant:normal;font-weight:normal;font-size:18px;font-family:'Times New Roman';-inkscape-font-specification:TimesNewRomanPSMT;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text78"><tspan
+             x="0 5.0040002 10.998 15.498 21.492001 26.496 34.542 43.542 53.694 62.694 67.769997"
+             y="0"
+             sodipodi:role="line"
+             id="tspan76">if flag&gt;0: </tspan></text></g></g><g
+       id="g80"><g
+         id="g82"
+         clip-path="url(#clipPath86)"><text
+           transform="matrix(1,0,0,-1,160.1,327.96)"
+           style="font-variant:normal;font-weight:normal;font-size:18.024px;font-family:'Times New Roman';-inkscape-font-specification:TimesNewRomanPSMT;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text90"><tspan
+             x="0"
+             y="0"
+             id="tspan88">Y</tspan></text></g></g><g
+       id="g92"><g
+         id="g94"
+         clip-path="url(#clipPath98)"><text
+           transform="matrix(1,0,0,-1,177.02,327.96)"
+           style="font-variant:normal;font-weight:normal;font-size:18.024px;font-family:'Times New Roman';-inkscape-font-specification:TimesNewRomanPSMT;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text102"><tspan
+             x="0 10.165536 14.671536 28.568041 36.570698 41.635441 55.549969 64.561966 69.572639 75.574631 92.517189 101.52919 106.03519"
+             y="0"
+             sodipodi:role="line"
+             id="tspan100">= matmul(W1, </tspan></text></g></g><g
+       id="g104"><g
+         id="g106"
+         clip-path="url(#clipPath110)"><text
+           transform="matrix(1,0,0,-1,287.66,327.96)"
+           style="font-variant:normal;font-weight:normal;font-size:18.024px;font-family:'Times New Roman';-inkscape-font-specification:TimesNewRomanPSMT;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text114"><tspan
+             x="0"
+             y="0"
+             id="tspan112">X</tspan></text></g></g><g
+       id="g116"><g
+         id="g118"
+         clip-path="url(#clipPath122)"><text
+           transform="matrix(1,0,0,-1,300.62,327.96)"
+           style="font-variant:normal;font-weight:normal;font-size:18.024px;font-family:'Times New Roman';-inkscape-font-specification:TimesNewRomanPSMT;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text126"><tspan
+             x="0 6.0019922"
+             y="0"
+             sodipodi:role="line"
+             id="tspan124">) </tspan></text></g></g><g
+       id="g128"><g
+         id="g130"
+         clip-path="url(#clipPath134)"><text
+           transform="matrix(1,0,0,-1,133.82,306.34)"
+           style="font-variant:normal;font-weight:normal;font-size:18px;font-family:'Times New Roman';-inkscape-font-specification:TimesNewRomanPSMT;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text138"><tspan
+             x="0 7.9920001 13.068 20.07 28.062 33.066002"
+             y="0"
+             sodipodi:role="line"
+             id="tspan136">else: </tspan></text></g></g><g
+       id="g140"><g
+         id="g142"
+         clip-path="url(#clipPath146)"><text
+           transform="matrix(1,0,0,-1,160.1,284.74)"
+           style="font-variant:normal;font-weight:normal;font-size:18px;font-family:'Times New Roman';-inkscape-font-specification:TimesNewRomanPSMT;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text150"><tspan
+             x="0"
+             y="0"
+             id="tspan148">Y</tspan></text></g></g><g
+       id="g152"><g
+         id="g154"
+         clip-path="url(#clipPath158)"><text
+           transform="matrix(1,0,0,-1,177.02,284.74)"
+           style="font-variant:normal;font-weight:normal;font-size:18px;font-family:'Times New Roman';-inkscape-font-specification:TimesNewRomanPSMT;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text162"><tspan
+             x="0 10.152 14.652 28.566 36.557999 41.633999 55.548 64.547997 69.552002 75.545998 92.538002 101.538 106.038"
+             y="0"
+             sodipodi:role="line"
+             id="tspan160">= matmul(W2, </tspan></text></g></g><g
+       id="g164"><g
+         id="g166"
+         clip-path="url(#clipPath170)"><text
+           transform="matrix(1,0,0,-1,287.66,284.74)"
+           style="font-variant:normal;font-weight:normal;font-size:18px;font-family:'Times New Roman';-inkscape-font-specification:TimesNewRomanPSMT;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text174"><tspan
+             x="0"
+             y="0"
+             id="tspan172">X</tspan></text></g></g><g
+       id="g176"><g
+         id="g178"
+         clip-path="url(#clipPath182)"><text
+           transform="matrix(1,0,0,-1,300.62,284.74)"
+           style="font-variant:normal;font-weight:normal;font-size:18px;font-family:'Times New Roman';-inkscape-font-specification:TimesNewRomanPSMT;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text186"><tspan
+             x="0 5.994"
+             y="0"
+             sodipodi:role="line"
+             id="tspan184">) </tspan></text></g></g><g
+       id="g188"><g
+         id="g190"
+         clip-path="url(#clipPath194)"><text
+           transform="matrix(1,0,0,-1,133.1,263.14)"
+           style="font-variant:normal;font-weight:normal;font-size:18px;font-family:'Times New Roman';-inkscape-font-specification:TimesNewRomanPSMT;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text198"><tspan
+             x="0"
+             y="0"
+             id="tspan196">Y</tspan></text></g></g><g
+       id="g200"><g
+         id="g202"
+         clip-path="url(#clipPath206)"><text
+           transform="matrix(1,0,0,-1,150.02,263.14)"
+           style="font-variant:normal;font-weight:normal;font-size:18px;font-family:'Times New Roman';-inkscape-font-specification:TimesNewRomanPSMT;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text210"><tspan
+             x="0 10.2"
+             y="0"
+             sodipodi:role="line"
+             id="tspan208">= </tspan></text></g></g><g
+       id="g212"><g
+         id="g214"
+         clip-path="url(#clipPath218)"><text
+           transform="matrix(1,0,0,-1,163.94,263.14)"
+           style="font-variant:normal;font-weight:normal;font-size:18px;font-family:'Times New Roman';-inkscape-font-specification:TimesNewRomanPSMT;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text222"><tspan
+             x="0"
+             y="0"
+             id="tspan220">Y</tspan></text></g></g><g
+       id="g224"><g
+         id="g226"
+         clip-path="url(#clipPath230)"><text
+           transform="matrix(1,0,0,-1,180.74,263.14)"
+           style="font-variant:normal;font-weight:normal;font-size:18px;font-family:'Times New Roman';-inkscape-font-specification:TimesNewRomanPSMT;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text234"><tspan
+             x="0 10.152 14.652 23.652"
+             y="0"
+             sodipodi:role="line"
+             id="tspan232">+ b </tspan></text></g></g><g
+       id="g236"><g
+         id="g238"
+         clip-path="url(#clipPath242)"><text
+           transform="matrix(1,0,0,-1,133.1,241.54)"
+           style="font-variant:normal;font-weight:normal;font-size:18px;font-family:'Times New Roman';-inkscape-font-specification:TimesNewRomanPSMT;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text246"><tspan
+             x="0"
+             y="0"
+             id="tspan244">Y</tspan></text></g></g><g
+       id="g248"><g
+         id="g250"
+         clip-path="url(#clipPath254)"><text
+           transform="matrix(1,0,0,-1,150.02,241.54)"
+           style="font-variant:normal;font-weight:normal;font-size:18px;font-family:'Times New Roman';-inkscape-font-specification:TimesNewRomanPSMT;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text258"><tspan
+             x="0 10.152 14.652 20.646 28.638 33.695999 42.695999"
+             y="0"
+             sodipodi:role="line"
+             id="tspan256">= relu(</tspan></text></g></g><g
+       id="g260"><g
+         id="g262"
+         clip-path="url(#clipPath266)"><text
+           transform="matrix(1,0,0,-1,198.74,241.54)"
+           style="font-variant:normal;font-weight:normal;font-size:18px;font-family:'Times New Roman';-inkscape-font-specification:TimesNewRomanPSMT;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text270"><tspan
+             x="0"
+             y="0"
+             id="tspan268">Y</tspan></text></g></g><g
+       id="g272"><g
+         id="g274"
+         clip-path="url(#clipPath278)"><text
+           transform="matrix(1,0,0,-1,211.7,241.54)"
+           style="font-variant:normal;font-weight:normal;font-size:18px;font-family:'Times New Roman';-inkscape-font-specification:TimesNewRomanPSMT;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text282"><tspan
+             x="0 5.994"
+             y="0"
+             sodipodi:role="line"
+             id="tspan280">) </tspan></text></g></g><g
+       id="g284"><g
+         id="g286"
+         clip-path="url(#clipPath290)"><text
+           transform="matrix(1,0,0,-1,133.82,219.94)"
+           style="font-variant:normal;font-weight:normal;font-size:18.024px;font-family:'Times New Roman';-inkscape-font-specification:TimesNewRomanPSMT;writing-mode:lr-tb;fill:#0070c0;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text294"><tspan
+             x="0 6.0019922 14.004648 19.069391 28.081392 34.083385"
+             y="0"
+             sodipodi:role="line"
+             id="tspan292">return</tspan></text></g></g><g
+       id="g296"><g
+         id="g298"
+         clip-path="url(#clipPath302)"><text
+           transform="matrix(1,0,0,-1,180.62,219.94)"
+           style="font-variant:normal;font-weight:normal;font-size:18.024px;font-family:'Times New Roman';-inkscape-font-specification:TimesNewRomanPSMT;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text306"><tspan
+             x="0"
+             y="0"
+             id="tspan304">Y</tspan></text></g></g><path
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-           transform="matrix(1,0,0,-1,483.82,404.59)"
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-           id="text5959"><tspan
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-             id="tspan5957">matmul</tspan></text></g></g><g
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-           id="text5971"><tspan
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-       id="g5975"><g
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-       id="g5987"><g
-         id="g5989"
-         clip-path="url(#clipPath5993)"><text
-           transform="matrix(1,0,0,-1,632.81,403.9)"
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-             id="tspan5995">算子反向计算</tspan></text></g></g><path
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-       id="g6001"><g
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-           id="text6011"><tspan
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-             id="tspan6033">算子</tspan></text></g></g><path
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+             sodipodi:role="line"
+             id="tspan474">运行前向</tspan></text></g></g><g
+       id="g478"><g
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+             x="0 8.0279999 13.308 20.388"
+             y="0"
+             sodipodi:role="line"
+             id="tspan486">ReLU</tspan></text></g></g><g
+       id="g490"><g
+         id="g492"
+         clip-path="url(#clipPath496)"><text
+           transform="matrix(1,0,0,-1,519.98,258.29)"
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+           id="text500"><tspan
+             x="0 12"
+             y="0"
+             sodipodi:role="line"
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+           id="text516"><tspan
+             x="0 8.0279999 13.308 20.388"
+             y="0"
+             sodipodi:role="line"
+             id="tspan514">ReLU</tspan></text></g></g><g
+       id="g518"><g
+         id="g520"
+         clip-path="url(#clipPath524)"><text
+           transform="matrix(1,0,0,-1,634.13,256.61)"
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+           id="text528"><tspan
+             x="0 12 24 36 48 60"
+             y="0"
+             sodipodi:role="line"
+             id="tspan526">算子反向计算</tspan></text></g></g><path
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+       style="fill:#dae3f3;fill-opacity:1;fill-rule:evenodd;stroke:none"
+       id="path530" /><path
+       d="m 589.8,209.02 c 0,0.81 0.65,1.46 1.46,1.46 h 128.6 c 0.81,0 1.46,-0.65 1.46,-1.46 v -23 c 0,-0.81 -0.65,-1.46 -1.46,-1.46 h -128.6 c -0.81,0 -1.46,0.65 -1.46,1.46 z"
+       style="fill:none;stroke:#404040;stroke-width:1;stroke-linecap:butt;stroke-linejoin:round;stroke-miterlimit:10;stroke-dasharray:none;stroke-opacity:1"
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+       id="g534"><g
+         id="g536"
+         clip-path="url(#clipPath540)"><text
+           transform="matrix(1,0,0,-1,619.61,193.44)"
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+           id="text544"><tspan
+             x="0 12 24 36 48 60"
+             y="0"
+             sodipodi:role="line"
+             id="tspan542">梯度反向计算</tspan></text></g></g><path
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+       style="fill:#4472c4;fill-opacity:1;fill-rule:evenodd;stroke:none"
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+       d="m 488.64,368.58 h 2.37 v 11.46 h 4.74 v -11.46 h 2.37 l -4.74,-4.74 z"
+       style="fill:none;stroke:#2f528f;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:8;stroke-dasharray:none;stroke-opacity:1"
+       id="path548" /><path
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+       style="fill:#4472c4;fill-opacity:1;fill-rule:evenodd;stroke:none"
+       id="path550" /><path
+       d="m 488.64,293.46 h 2.37 v 11.46 h 4.74 v -11.46 h 2.37 l -4.74,-4.74 z"
+       style="fill:none;stroke:#2f528f;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:8;stroke-dasharray:none;stroke-opacity:1"
+       id="path552" /><path
+       d="m 660.36,375.24 h -2.4 v -11.4 h -4.8 v 11.4 h -2.4 l 4.8,4.8 z"
+       style="fill:#4472c4;fill-opacity:1;fill-rule:evenodd;stroke:none"
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new file mode 100644
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