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tap1012
Commit 71499d6f authored by Victor Hugo Pacheco Flores's avatar Victor Hugo Pacheco Flores
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Respuesta del primer ejercicio del segundo parcial.

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{
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"cell_type": "code",
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" <tr style=\"text-align: right;\">\n",
" <th></th>\n",
" <th>hello</th>\n",
" <th>omg</th>\n",
" <th>pony</th>\n",
" <th>she</th>\n",
" <th>there</th>\n",
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" hello omg pony she there went why\n",
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"source": [
"import math\n",
"import pandas as pd \n",
"import numpy as np\n",
"from sklearn.feature_extraction.text import CountVectorizer \n",
"\n",
"class MatrizDT:\n",
" \n",
" def __init__(self,d):\n",
" '''\n",
" Este es un constructor que se encarga de inicializar un objeto de la clase MatrizDT. Dicha función se encarga de\n",
" precargar todas las funciones mencionadas en la clase y asignarlas a variables de la clase. Esto se hizo de esta manera\n",
" debido a que al momento de calcular la función tfidf(), seria necesario calcular las dos variables anteriores de nuevo\n",
" si las funciones tuvieran el cálculo de cada variable. Entonces al llamar a la función tf() se hace un cálculo, si \n",
" se llama a la función idf() se hace un segundo cálculo, pero al llamar a la tercera función tfidf() esta tendría que \n",
" hacer el calculo de la primera función, el cálculo de la segunda y despues hacer el cálculo de la tercera, creando \n",
" uso de memoria adicional en la tercera función.\n",
" Al precargar todo desde el constructor, se cargan los tres cálculos desde el inicio, y al llamar las diferentes\n",
" funciones no es necesario precargar los datos adicionales del objeto.\n",
" \n",
" Args:\n",
" docs: un Array que contenga uno o más strings\n",
" \n",
" Ejemplo:\n",
" >>>docs = ['why hello there', 'omg hello hello pony', 'she went there? omg']\n",
" >>>c=MatrizDT(docs)\n",
" '''\n",
" self.documentos=d\n",
" vec = CountVectorizer()\n",
" x = vec.fit_transform(self.documentos)\n",
" \n",
" #primera función\n",
" matriz=np.array(x.toarray(),dtype=float)\n",
" for i in range(len(matriz)):\n",
" for j in range(len(matriz[0])):\n",
" if(matriz[i,j]!=0):\n",
" matriz[i][j]=1+math.log(matriz[i][j],10)\n",
" self.vtf= pd.DataFrame(matriz, columns=vec.get_feature_names())\n",
" \n",
" #segunda función\n",
" n=len(self.documentos)\n",
" res=np.zeros((len(matriz),len(matriz[0])))\n",
" for i in range(len(matriz[0])):\n",
" df_t=0\n",
" for j in range(len(matriz)):\n",
" if(matriz[j][i] !=0):\n",
" df_t +=1\n",
" val=math.log((n/df_t),10)\n",
" for k in range(len(matriz)):\n",
" res[k][i]=val\n",
" self.vidf = pd.DataFrame(res, columns=vec.get_feature_names())\n",
" \n",
" #tercera función\n",
" res2=np.zeros((len(matriz),len(matriz[0])))\n",
" for i in range(len(matriz)):\n",
" for j in range(len(matriz[0])):\n",
" res2[i][j]=matriz[i][j]*res[i][j]\n",
" self.vtfidf=pd.DataFrame(res2, columns=vec.get_feature_names())\n",
" \n",
" \n",
" def tf(self):\n",
" '''\n",
" Calcula cada frecuencia de termino por la siguiente función: 1 + log count(tj,di) siempre y cuando count(tj,di) sea \n",
" mayor a cero, en caso contrario solo deja el cero.\n",
" \n",
" Args: NA\n",
" \n",
" Ejemplo:\n",
" >>>c.tf()\n",
" \thello\tomg\tpony\tshe\tthere\twent\twhy\n",
" 0\t1.00000\t0.0\t0.0\t0.0\t1.0\t0.0\t1.0\n",
" 1\t1.30103\t1.0\t1.0\t0.0\t0.0\t0.0\t0.0\n",
" 2\t0.00000\t1.0\t0.0\t1.0\t1.0\t1.0\t0.0\n",
" '''\n",
" return self.vtf\n",
" \n",
" def idf(self):\n",
" '''\n",
" Calcula la matriz donde cada celda tiene el valor de la frecuencia inversa del término: log(n/dft) donde n es el \n",
" número total de documentos y dft es el número de textos en los cuales aparece el término t.\n",
" \n",
" Args: NA\n",
" \n",
" Ejemplo:\n",
" >>>c.idf()\n",
" \thello\tomg\tpony\tshe\tthere\twent\twhy\n",
" 0\t0.176091\t0.176091\t0.477121\t0.477121\t0.176091\t0.477121\t0.477121\n",
" 1\t0.176091\t0.176091\t0.477121\t0.477121\t0.176091\t0.477121\t0.477121\n",
" 2\t0.176091\t0.176091\t0.477121\t0.477121\t0.176091\t0.477121\t0.477121\n",
" '''\n",
" return self.vidf\n",
" \n",
" def tfidf(self):\n",
" '''\n",
" Calcula el producto de la frecuencia de término y de la frecuencia inversa del término. Osea el producto por elemento \n",
" de las dos funciones anteriores.\n",
" \n",
" Args: NA\n",
" \n",
" Ejemplo:\n",
" >>>c.tfidf()\n",
" \thello\tomg\tpony\tshe\tthere\twent\twhy\n",
" 0\t0.176091\t0.000000\t0.000000\t0.000000\t0.176091\t0.000000\t0.477121\n",
" 1\t0.229100\t0.176091\t0.477121\t0.000000\t0.000000\t0.000000\t0.000000\n",
" 2\t0.000000\t0.176091\t0.000000\t0.477121\t0.176091\t0.477121\t0.000000\n",
" '''\n",
" return self.vtfidf\n",
" \n",
" \n",
"docs = ['why hello there', 'omg hello hello pony', 'she went there? omg']\n",
"\n",
"c=MatrizDT(docs)\n",
"c.tf()"
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"metadata": {},
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" hello omg pony she there went why\n",
"0 0.176091 0.176091 0.477121 0.477121 0.176091 0.477121 0.477121\n",
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"metadata": {},
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"source": [
"c.idf()"
]
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"cell_type": "code",
"execution_count": 4,
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"text/plain": [
" hello omg pony she there went why\n",
"0 0.176091 0.000000 0.000000 0.000000 0.176091 0.000000 0.477121\n",
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"c.tfidf()"
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