From 49af6ec1d763cdca4851b8fb74fea90afe789951 Mon Sep 17 00:00:00 2001 From: Charu Date: Sat, 24 Mar 2018 14:19:11 +0530 Subject: [PATCH 1/4] Added ensemble learner in learning.ipynb --- learning.ipynb | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/learning.ipynb b/learning.ipynb index dca2b294f..37603bfcd 100644 --- a/learning.ipynb +++ b/learning.ipynb @@ -1716,6 +1716,48 @@ "The correct output is 0, which means the item belongs in the first class, \"setosa\". Note that the Perceptron algorithm is not perfect and may produce false classifications." ] }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## ENSEMBLE LEARNER\n", + "\n", + "### Overview\n", + "\n", + "Ensemble Learning improves the performance of our model by combining several learners. It improvise the stability and predictive power of the model. Ensemble methods are meta-algorithms that combine several machine learning techniques into one predictive model in order to decrease variance, bias, or improve predictions. \n", + "\n", + "\n", + "![ensemble_learner.jpg](images/ensemble_learner.jpg)\n", + "\n", + "Some commonly used Ensemble Learning techniques are : \n", + "\n", + "1. Bagging : Bagging tries to implement similar learners on small sample populations and then takes a mean of all the predictions. It helps us to reduce variance error.\n", + "\n", + "2. Boosting : Boosting is an iterative technique which adjust the weight of an observation based on the last classification. If an observation was classified incorrectly, it tries to increase the weight of this observation and vice versa. It helps us to reduce bias error.\n", + "\n", + "3. Stacking : This is a very interesting way of combining models. Here we use a learner to combine output from different learners. It can either decrease bias or variance error depending on the learners we use.\n", + "\n", + "### Implementation\n", + "\n", + "Below mentioned is the implementation of Random Forest Algorithm." + ] + }, + { + "cell_type": "code", + "execution_count": null, + "metadata": {}, + "outputs": [], + "source": [ + "psource(EnsembleLearner)" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "This algorithm takes input as a list of learning algorithms, have them vote and then finally returns the predicted result." + ] + }, { "cell_type": "markdown", "metadata": {}, From 43fd4064e532096fe195e7e8d8b3fb0da99b3030 Mon Sep 17 00:00:00 2001 From: Charu Date: Sat, 24 Mar 2018 14:20:21 +0530 Subject: [PATCH 2/4] Added ensemble_learner.jpg --- images/ensemble_learner.jpg | Bin 0 -> 16575 bytes 1 file changed, 0 insertions(+), 0 deletions(-) create mode 100644 images/ensemble_learner.jpg diff --git a/images/ensemble_learner.jpg b/images/ensemble_learner.jpg new file mode 100644 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z=^id<3NIMb0At}TF18+1<3?~^aYLC57Knr@YeW7%ckAoei~rwX&k%g7#^X1aOc5(j zArL83zrbK{;7HV`^c!h-E^QY;9`DuL+JD^n-MmvZ`y|S>ppu7HpSR+0?j9R9fKI#$ z=E2ztAE!-XwJQ9p`b{s-`&dXa1&!&wZJv=?_8UF;^Wo*#* zA|pFo(&|nIiNx@TUSSJM78rLgGv~~_)Q1j}GD;M>kHo9^wou~`W10}uLTswUP)=6d zMXRp*rq13^Rr75cW~+V}1APA{AVU2wUkCHAasSQ+I1c+-#J-P| zvuN>P9evX{S(}`|^PTvAM(xDs4^{v-mUM-4&XT~C$k>~BVw00_whKI#pHX^k7F*u7 z*oLvIvxUlg`}>Th1W35ase4fd8Nd8d@qee>_wXx!yz`^7L7>ki$B$$ ctQLbk@)@0ko3E&=_yzDq?Z4QO`*wT(KW*LSlK=n! literal 0 HcmV?d00001 From 825216bf2d684e54bff93316ce5ce099ae02586e Mon Sep 17 00:00:00 2001 From: Charu Date: Sat, 24 Mar 2018 14:26:05 +0530 Subject: [PATCH 3/4] Update learning.ipynb --- learning.ipynb | 2 ++ 1 file changed, 2 insertions(+) diff --git a/learning.ipynb b/learning.ipynb index 37603bfcd..049634a24 100644 --- a/learning.ipynb +++ b/learning.ipynb @@ -1727,8 +1727,10 @@ "Ensemble Learning improves the performance of our model by combining several learners. It improvise the stability and predictive power of the model. Ensemble methods are meta-algorithms that combine several machine learning techniques into one predictive model in order to decrease variance, bias, or improve predictions. \n", "\n", "\n", + "\n", "![ensemble_learner.jpg](images/ensemble_learner.jpg)\n", "\n", + "\n", "Some commonly used Ensemble Learning techniques are : \n", "\n", "1. Bagging : Bagging tries to implement similar learners on small sample populations and then takes a mean of all the predictions. It helps us to reduce variance error.\n", From 16c193890c83b23cc6f5af4329b38ec5de870248 Mon Sep 17 00:00:00 2001 From: Charu Date: Sat, 24 Mar 2018 16:55:24 +0530 Subject: [PATCH 4/4] Update learning.ipynb --- learning.ipynb | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/learning.ipynb b/learning.ipynb index 049634a24..bce7967f2 100644 --- a/learning.ipynb +++ b/learning.ipynb @@ -1741,7 +1741,7 @@ "\n", "### Implementation\n", "\n", - "Below mentioned is the implementation of Random Forest Algorithm." + "Below mentioned is the implementation of Ensemble Learner." ] }, {