Document MMM schema.

PiperOrigin-RevId: 786067236

Author: ronellecaguioa

.github/actions/install-meridian/action.yml

@@ -10,13 +10,17 @@ runs:
   using: composite
   steps:
     # Install deps
+    - name: Install Protoc
+      uses: arduino/setup-protoc@v3
+      with:
+        version: "27.x"
     - uses: actions/setup-python@v5
       with:
         python-version: ${{ inputs.python_version }}
         cache: pip
         cache-dependency-path: '**/pyproject.toml'
     - shell: bash
       run: |
-        pip install -e .[dev,jax,mlflow] --config-settings editable_mode=strict
+        pip install -e .[dev,jax,mlflow,schema] --config-settings editable_mode=strict
         pip freeze
 

meridian/__init__.py

@@ -13,12 +13,14 @@
 # limitations under the License.
 
 """Meridian API."""
+
 from meridian import analysis
 from meridian import backend
 from meridian import data
 from meridian import model
 from meridian.version import __version__
 
+
 try:
   from meridian import mlflow  # pylint: disable=g-import-not-at-top
 except ImportError:

proto/LICENSE

@@ -0,0 +1,202 @@
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proto/README.md

@@ -0,0 +1,20 @@
+# About MMM Proto Schema
+
+The MMM Proto Schema is a framework-agnostic data standard that provides a
+consistent and serializable way to represent a trained Marketing Mix Model
+(MMM). Its core purpose is to establish a common language for the outputs of an
+MMM, primarily within its current Python-centric implementation. This allows the
+results from models built using various tools or methodologies to be uniformly
+represented, stored, shared, and compared by Python-based applications and
+workflows. By offering this standardized representation, the schema aims to
+enhance interoperability and facilitate downstream applications, such as scenario
+planning, optimization, and consistent reporting, independent of how the original
+model was constructed.
+
+## Install Meridian with MMM Proto Schema
+Currently, this package can only be installed from source code:
+```sh
+git clone https://github.com/google/meridian.git;
+cd meridian;
+pip install .[schema];
+```

proto/__init__.py

@@ -0,0 +1,17 @@
+# Copyright 2025 The Meridian Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Module for MMM Proto Schema."""
+
+__version__ = "1.0.0"

proto/mmm/v1/common/date_interval.proto

@@ -0,0 +1,33 @@
+// Copyright 2025 The Meridian Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+edition = "2023";
+
+package mmm.v1.common;
+
+import "google/type/date.proto";
+
+option features.field_presence = IMPLICIT;
+option java_multiple_files = true;
+
+message DateInterval {
+  // The start date of the interval. Inclusive. Required.
+  google.type.Date start_date = 1;
+
+  // The end date of the interval. Exclusive. Required.
+  google.type.Date end_date = 2;
+
+  // A tag to identify the date interval. Optional.
+  string tag = 3;
+}

proto/mmm/v1/common/estimate.proto

@@ -0,0 +1,43 @@
+// Copyright 2025 The Meridian Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+edition = "2023";
+
+package mmm.v1.common;
+
+option features.field_presence = IMPLICIT;
+option java_multiple_files = true;
+
+// Contains an estimate value of estimand and associated quantified
+// uncertainties.
+message Estimate {
+  // The estimate value of an estimand. Required.
+  double value = 1;
+
+  // The uncertainty of an estimate quantified by probability interval.
+  message Uncertainty {
+    // The probability that a value is inside an interval bounded by lowerbound
+    // and upperbound. Required.
+    double probability = 1;
+
+    // The lowerbound of the interval. Required.
+    double lowerbound = 2;
+
+    // The upperbound of the interval. Required.
+    double upperbound = 3;
+  }
+
+  // The quantified uncertainties.
+  repeated Uncertainty uncertainties = 2;
+}

proto/mmm/v1/common/kpi_type.proto

@@ -0,0 +1,31 @@
+// Copyright 2025 The Meridian Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+edition = "2023";
+
+package mmm.v1.common;
+
+option java_multiple_files = true;
+
+// Different KPI types used in marketing performance and optimization.
+enum KpiType {
+  KPI_TYPE_UNSPECIFIED = 0;
+
+  // Some generic user-defined KPI unit.
+  NON_REVENUE = 1;
+
+  // KPI defined as revenue specifically, or some KPI unit after conversion
+  // to revenue.
+  REVENUE = 2;
+}