fixed date error

trieule94 · Jul 26, 2017 · c24d07a · c24d07a
1 parent 72b2d44
commit c24d07a
Showing 1 changed file with 43 additions and 15 deletions.
diff --git a/nbs/1. Why are we here?.ipynb b/nbs/1. Why are we here?.ipynb
@@ -178,29 +178,37 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "heading_collapsed": true
+   },
    "source": [
     "#### Matrix-Matrix Products"
    ]
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "hidden": true
+   },
    "source": [
     "<img src=\"images/shop.png\" alt=\"floating point\" style=\"width: 100%\"/>(Source: [Several Simple Real-world Applications of Linear Algebra Tools](https://www.mff.cuni.cz/veda/konference/wds/proc/pdf06/WDS06_106_m8_Ulrychova.pdf))"
    ]
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "heading_collapsed": true
+   },
    "source": [
     "#### Answer"
    ]
   },
   {
    "cell_type": "code",
    "execution_count": 23,
-   "metadata": {},
+   "metadata": {
+    "hidden": true
+   },
    "outputs": [
     {
      "data": {
@@ -221,14 +229,18 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "heading_collapsed": true
+   },
    "source": [
     "#### Image Data"
    ]
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "hidden": true
+   },
    "source": [
     "Images can be represented by matrices.\n",
     "\n",
@@ -239,14 +251,18 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "heading_collapsed": true
+   },
    "source": [
     "#### Convolution"
    ]
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "hidden": true
+   },
    "source": [
     "*Convolutions* are the heart of convolutional neural networks (CNNs), a type of deep learning, responsible for the huge advances in image recognitionin the last few years.  They are now increasingly being used for speech as well, such as [Facebook AI's results](https://code.facebook.com/posts/1978007565818999/a-novel-approach-to-neural-machine-translation/) for speech translation which are 9x faster than RNNs (the current most popular approach for speech translation).\n",
     "\n",
@@ -276,21 +292,27 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "heading_collapsed": true
+   },
    "source": [
     "### Matrix Decompositions"
    ]
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "hidden": true
+   },
    "source": [
     "We will be talking about Matrix Decompositions every day of this course, and will cover the below examples in future lessons:"
    ]
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "hidden": true
+   },
    "source": [
     "- **Topic Modeling** (NMF and SVD.  SVD uses QR)  A group of documents can be represented by a term-document matrix\n",
     "<img src=\"images/document_term.png\" alt=\"term-document matrix\" style=\"width: 70%\"/>\n",
@@ -301,15 +323,19 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "hidden": true
+   },
    "source": [
     "- **Background removal** (robust PCA, which uses truncated SVD)\n",
     "![background removal](images/surveillance3.png)"
    ]
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "hidden": true
+   },
    "source": [
     "- **Google's PageRank Algorithm** (eigen decomposition)\n",
     "\n",
@@ -319,7 +345,9 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "hidden": true
+   },
    "source": [
     "- List of other decompositions and some applications [matrix factorization jungle](https://sites.google.com/site/igorcarron2/matrixfactorizations)"
    ]
@@ -508,7 +536,7 @@
    "metadata": {},
    "source": [
     "Timeline History of Floating Point Arithmetic:\n",
-    "- ~8000 BC: Babylonian radix-60 system was earliest floating-point system (Donald Knuth).  Represented the significand of a radix-60 floating-point representation (if ratio of two numbers is a power of 60, represented the same)\n",
+    "- ~1600 BC: Babylonian radix-60 system was earliest floating-point system (Donald Knuth).  Represented the significand of a radix-60 floating-point representation (if ratio of two numbers is a power of 60, represented the same)\n",
     "- 1630 Slide rule.  Manipulate only significands (radix-10)\n",
     "- 1914 Leonardo Torres y Quevedo described an electromechanical implementation of Babbage's Analytical Engine with Floating Point Arithmetic.\n",
     "- 1941 First real, modern implementation.  Konrad Zuse's Z3 computer.  Used radix-2, with 14 bit significand, 7 bit exponents, and 1 sign bit.\n",