remove build yml in Makefile

Makefile

 all: html
 
-build/%.ipynb: %.md build/build.yml build/md2ipynb.py $(wildcard gluonbook/*)
+build/%.ipynb: %.md build/md2ipynb.py $(wildcard gluonbook/*)
 	@mkdir -p $(@D)
 	cd $(@D); python ../md2ipynb.py ../../$< ../../$@
 

chapter_natural-language-processing/glove.md

@@ -43,10 +43,11 @@ $$\sum_{i\in\mathcal{V}} \sum_{j\in\mathcal{V}} h(x_{ij}) \left(\mathbf{u}_j^\to
 
 |$w_k$=|“solid”|“gas”|“water”|“fashion”|
 |--:|:-:|:-:|:-:|
-|$p_1=\mathbb{P}(w_k\mid\text{ice})$|0.00019|0.000066|0.003|0.000017|
-|$p_2=\mathbb{P}(w_k\mid\text{steam})$|0.000022|0.00078|0.0022|0.000018|
+|$p_1=\mathbb{P}(w_k\mid\text{"ice"})$|0.00019|0.000066|0.003|0.000017|
+|$p_2=\mathbb{P}(w_k\mid\text{"steam"})$|0.000022|0.00078|0.0022|0.000018|
 |$p_1/p_2$|8.9|0.085|1.36|0.96|
 
+
 我们可以观察到以下现象：
 
 * 对于与“ice”相关而与“steam”不相关的词$w_k$，例如$w_k=$“solid”（“固体”），我们期望条件概率比值较大，例如上表最后一行中的值8.9；