diff --git a/examples/core_examples/pipe_example.yml b/examples/core_examples/pipe_example.yml
index 9ea1cdb..7bc5ce8 100644
--- a/examples/core_examples/pipe_example.yml
+++ b/examples/core_examples/pipe_example.yml
@@ -12,15 +12,26 @@ stages:
   module_name: rail.creation.engines.flowEngine
   name: flow_engine_test
   nprocess: 1
+  aliases:
+    output: output_flow_engine_test
 - classname: LSSTErrorModel
   module_name: rail.creation.degraders.lsst_error_model
   name: lsst_error_model_test
   nprocess: 1
+  aliases:
+    input: output_flow_engine_test
+    output: output_lsst_error_model_test
 - classname: ColumnMapper
   module_name: rail.tools.table_tools
   name: col_remapper_test
   nprocess: 1
+  aliases:
+    input: output_lsst_error_model_test
+    output: output_col_remapper_test
 - classname: TableConverter
   module_name: rail.tools.table_tools
   name: table_conv_test
   nprocess: 1
+  aliases:
+    input: output_col_remapper_test
+    output: output_table_conv_test
diff --git a/examples/core_examples/pipe_example_config.yml b/examples/core_examples/pipe_example_config.yml
index c871d35..55cbc37 100644
--- a/examples/core_examples/pipe_example_config.yml
+++ b/examples/core_examples/pipe_example_config.yml
@@ -1,7 +1,4 @@
 col_remapper_test:
-  aliases:
-    input: output_lsst_error_model_test
-    output: output_col_remapper_test
   chunk_size: 100000
   columns:
     mag_g_lsst_err: mag_err_g_lsst
@@ -17,8 +14,6 @@ col_remapper_test:
   name: col_remapper_test
   output_mode: default
 flow_engine_test:
-  aliases:
-    output: output_flow_engine_test
   config: null
   model: ${FLOWDIR}/pretrained_flow.pkl
   n_samples: 50
@@ -36,9 +31,6 @@ lsst_error_model_test:
     y: 23.73
     z: 24.16
   airmass: 1.2
-  aliases:
-    input: output_flow_engine_test
-    output: output_lsst_error_model_test
   bandNames:
     g: mag_g_lsst
     i: mag_i_lsst
@@ -96,9 +88,6 @@ lsst_error_model_test:
     z: 0.69
   tvis: 30.0
 table_conv_test:
-  aliases:
-    input: output_col_remapper_test
-    output: output_table_conv_test
   config: null
   input: None
   name: table_conv_test
diff --git a/examples/estimation_examples/pzflow_demo.ipynb b/examples/estimation_examples/pzflow_demo.ipynb
new file mode 100644
index 0000000..12aec82
--- /dev/null
+++ b/examples/estimation_examples/pzflow_demo.ipynb
@@ -0,0 +1,179 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "id": "327d391f-58bc-4b6a-9bbe-3987b969c8f4",
+   "metadata": {},
+   "source": [
+    "PZFlow Informer and Estimator Demo\n",
+    "\n",
+    "Author: Tianqing Zhang\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "916a05ad",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "%matplotlib inline\n",
+    "import os\n",
+    "import matplotlib.pyplot as plt\n",
+    "import numpy as np\n",
+    "import pandas as pd\n",
+    "\n",
+    "import rail\n",
+    "from rail.core.data import TableHandle\n",
+    "from rail.core.stage import RailStage\n",
+    "import qp\n",
+    "import tables_io\n",
+    "\n",
+    "from rail.estimation.algos.pzflow_nf import PZFlowInformer, PZFlowEstimator\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "d8ef87d3",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "DS = RailStage.data_store\n",
+    "DS.__class__.allow_overwrite = True"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "f79c3a7b",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from rail.utils.path_utils import find_rail_file\n",
+    "trainFile = find_rail_file('examples_data/testdata/test_dc2_training_9816.hdf5')\n",
+    "testFile = find_rail_file('examples_data/testdata/test_dc2_validation_9816.hdf5')\n",
+    "training_data = DS.read_file(\"training_data\", TableHandle, trainFile)\n",
+    "test_data = DS.read_file(\"test_data\", TableHandle, testFile)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "756d78a3",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "pzflow_dict = dict(hdf5_groupname='photometry',output_mode = 'not_fiducial' )\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "0857e6bb-18eb-4f89-bc4b-29bed1ffa122",
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "1042a9f3",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "\n",
+    "# epoch = 200 gives a reasonable converged loss\n",
+    "pzflow_train = PZFlowInformer.make_stage(name='inform_pzflow',model='demo_pzflow.pkl',num_training_epochs = 30, **pzflow_dict)\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "c407f45b",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# training of the pzflow\n",
+    "pzflow_train.inform(training_data)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "156b6e3d",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "pzflow_dict = dict(hdf5_groupname='photometry')\n",
+    "\n",
+    "pzflow_estimator = PZFlowEstimator.make_stage(name='estimate_pzflow',model='demo_pzflow.pkl',**pzflow_dict, chunk_size = 20000)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "00911d60",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# estimate using the test data\n",
+    "estimate_results = pzflow_estimator.estimate(test_data)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "4cbdece3",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "mode = estimate_results.read(force=True).ancil['zmode']\n",
+    "truth = np.array(test_data.data['photometry']['redshift'])"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "ba076bab-c5ab-4292-8de9-415e7b30af5c",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# visualize the prediction. \n",
+    "plt.figure(figsize = (8,8))\n",
+    "plt.scatter(truth, mode, s = 0.5)\n",
+    "plt.xlabel('True Redshift')\n",
+    "plt.ylabel('Mode of Estimated Redshift')"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "ed5bf266-3b5c-4d9b-8428-77a2833cafef",
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.10.0"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}